From one of the reviewers of the paper of OSCAR for DataScience2019:
One thing I've noticed playing with the results from http://opencitations.net/search?text=machine+learning : if one sorts the results by the number of citations, and limits the number of results visualized, he gets the first ten results in the result set, not the first ten most-cited papers. This is extremely counterintuitive!
From one of the reviewers of the paper of OSCAR for DataScience2019: