2 articles have more than 50 co-authors and are therefore not shown.F.C.J. Ketelaar published from 2000 upto 2015 a total of 64 publications (at the UvA) with 50 or less co-authors. 37 unique co-authors in total with an average of 1.03 per article.The blue stripe (alt text: self) is the position of F.C.J. Ketelaar in the write position for the article. Every row is an unique article. The amount of credits for a certain Author position, also called write position, does differ by discipline. Some journals publish author names in alphabetical order. This is common practice by publications with many authors.