May 2012

Ed PentzFrom the Executive Director

It’s been a very busy few months for CrossRef. We launched CrossMark, a major new service, FundRef, a major new pilot project and pdf-extract/Extracto, open source software/service that extracts references from journal article PDFs. We have also seen strong growth in the number of members, the amount of content (especially books) and the CrossRef Cited-by Linking and CrossCheck services. Details on all these developments are below.

On the subject of CrossMark I would encourage all CrossRef members to give serious consideration to participating in this new optional service. I believe it will have a major impact on scholarly communications and will be very useful to researchers. In addition, it will highlight the critical role that publishers play in certifying and maintaining content and issuing corrections, retractions and enhancements. At present there is no consistency in how publishers notify readers of corrections, retractions and enhancements and, in the case of PDFs downloaded to local hard drives, readers have no way of knowing if the article has been updated. CrossMark addresses these issues through an innovative service.

CrossRef has a great team so I want to thank all the staff for their contributions. In particular, congratulations to Patricia Feeney, Product Support Manager, for 5 years of service and to Chuck Koscher, Director of Technology, for 10 years of service. In addition, welcome to Amy Bosworth, our new Accounts Receivable Assistant and Rachael Lammey, Product Manager (maternity cover for Kirsty Meddings) and Jo Steele, Office Administrator (maternity cover for Siama Begum).


The CrossMark update identification system is now open for participation from all CrossRef members in good standing. Participating publishers mark their content with a CrossMark logo to indicate that they have made a commitment to actively maintain it. Description: on the logo alerts researchers of any important changes that would change the interpretation or crediting of the work, typically corrections, errata, change of authorship, editions, or retractions.

Publishers may also include optional publication record information (non-bibliographic metadata) like funding sources, peer review, rights, publication history, or location or related data or articles. Six CrossRef member publishers have been piloting the CrossMark service for the past year. Currently over 20,000 documents from 21 journals are displaying live CrossMark logos. Of these, approximately 300 are indicating some form of change or correction. See the CrossMark website for more information and to sign up.

DOIs in Use: CrossMark Status Tab Examples

Below please find two examples of articles with CrossMark logos. Clicking on the CrossMark logo shows whether the article is current or has updates.  The first example is from the Journal of Legal Analysis from Oxford University Press. The status of this article is current.


oup crossmark status current

The second example is from an IUCR journal called Acta Crystallographica Section D - Biological Crystallography.  This examples shows that there are updates available for this article.

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(Note: you can open the status box if follow the DOI to the article page and then click on the CrossMark logo displayed on the article landing page.)

CrossRef Labs: Extracting References from PDFs

crossref labs logoCrossRef Labs has released an open source tool to extract and tag references from PDF instances of scholarly documents. Pdf-extract is available for download from CrossRef Labs, and a web-based interface called Extracto is also available.

The extracted references can be used to identify the CrossRef DOI using tools such as Simple Text Query and CrossRef Metadata Search.

These tools are a first step in helping our members, especially those who publish in PDF only, to more easily comply with CrossRef’s outbound reference linking requirement for journal content. They are still under development, and the labs team welcomes feedback and suggestions.


With 5 million CrossRef DOIs and counting, books remain the fastest growing content type at CrossRef. This number includes more than 290,000 book titles, and many reference entries and chapters.

The CrossRef Books Interest Group is working on revising the Best Practices document for assigning CrossRef DOIs for books. If you have any suggestions, or if you want to get involved, please contact Carol Anne Meyer.

Digital Archivist Jason Scott To Keynote At Crossref Annual Meeting

Jason Scott, coordinator of the Archive Team, which is dedicated to saving digital heritage, will speak about preserving digital ephemera at CrossRef’s Annual meeting on Wednesday, 14 November.

This year’s event will take place at The Royal Society in London, UK. The CrossRef Workshops covering technical, operational and workflow issues will be held on Tuesday, 13 November. The second day will begin with our Annual Business Meeting followed by enlightening industry presentations and will end with a reception. We hope to see you there, so please save the date!

CrossRef Cited-by Linking

With the addition of 200 million Elsevier references CrossRef Cited-by Linking is growing rapidly. Cited-by Linking LogoThere are 17.7 million articles with references deposited and over 296 million cited-by links in CrossRef. Here’s an example article that has been cited 227 times – - click on the “cited by” tab next to the “abstract” tab.



More than 297 publishers have joined the CrossCheck plagiarism screening service powered by iThenticate. The growing service now includes a database of 67,000 indexed titles.

Please consider joining the CrossCheck user session, which will be held in July at the iParadigms user conference in Gateshead, UK on the morning of 17 July. Please register in advance.

To learn more please join us for an upcoming CrossCheck webinar listed on our web site. Or, to find out more about CrossCheck before applying, please email and we will be happy to answer any questions you may have. You may also find the Frequently Asked Questions on the web site useful.


On May 2nd CrossRef announced FundRef, a pilot collaboration between scholarly publishers and funding agencies that will standardize the names of research funders and add grant numbers attributed in journal articles or other scholarly documents. The collaboration would allow researchers, publishers, and funding agencies to track the published research that results from specific funding bodies. For more information, see the news release.

CrossRef member publishers may now elect to include the references they deposit at CrossRef as results in UNIXML query results as well as OAI-PMH results. This feature is managed on a prefix basis. In the past, references deposited for a CrossRef DOI were only /distributed to the current owner of the DOI or to Enhanced CrossRef Metadata Service Affiliates who receive our OAI-PMH data (when given permission by the current publisher). 
Contact if you would like reference distribution enabled for your prefix(es).


The first quarter 2012 deposit billing was sent via email or mail the first week of April. We are holding back billing under $100. All deposits will be billed in the subsequent quarter that they reach $100 or at year-end. Please send any changes of address or billing contacts to

Payment Update

If you pay via credit card, please phone your payment to Betty Momjian at +1 781 295 0072 x33 or fax it to +1 781 295 0076 which is a secure fax.  

We need the following:

  • invoice number being paid
  • name on card
  • billing address of card
  • type of card
  • card number
  • security code on card (3 or 4 digits)
  • expiration date 

Please do not email your credit card information any longer.

If you need the payment instruction sheet please email
Please include invoice numbers being paid on wire transfers so we can give you credit for your payment!


Please make sure your payments are up to date. It is alarming to us that so many annual fee invoices remain unpaid. We bill our annual fee on January 1st, and bills are sent several weeks prior to that date.  We bill deposit fees quarterly: March 31, June 30, September 30, December 31, and the quarterly bills are always sent approximately a week following the quarter's end. Bills are sent electronically from either or so please make sure these email addresses are on your "safe" list.

We revised our policies last year to extend the payment terms from net 30 to net 45 in order to accommodate our international members. We accept wires, checks, PayPal and credit cards. If you need a copy of the payment instructions please contact or

We are going to start sending collection emails immediately following the Q2 billing (Q2 ends on June 30) and then at least every 30 days.   Our policy is to temporarily shut off system access for unpaid bills after the 90-day email if we have not heard from you. It is important that we have the correct billing contacts, so please inform us of any changes.

CrossRef Statistics Dashboard

dasboard Q3

The CrossRef Board of Directors tracks the set of statistics in the table above since they are key metrics of success for the CrossRef System. The number of queries (references sent to CrossRef to find the DOI to create permanent links to the content) for the 1st quarter of 2012 are at a healthy 259 million. The matching rate (the percentage of references submitted that matched a DOI in the CrossRef System) significantly increased to 92 million from 49 (same period last year) as did the deposits - both current and backfile. The number of members and the amount of content in the system continues to grow at a steady rate (with the number of book titles increasing 89%) so the CrossRef System is looking very healthy in the 1st quarter of 2012.

Income Statement/Financial Results

Income Statement Q22010

The table above is from the 1st quarter operating report. Expenses for the 1st quarter are a bit below budget and revenues a bit above budget, which is a good sign. The full year forecast from 2011 was very close – both revenue and expenses were very close to budget for the year.