H.A. Heij published from 2000 upto 2019 a total of 7 publications (at the UvA) with 50 or less co-authors. 0 unique co-authors in total with an average of 4.29 per article.The blue stripe (alt text: self) is the position of H.A. Heij 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.