How to find out the corresponding author of a paper?
I tried to take a look at the metadata.
My first attempt was at CrossRef (http://api.crossref.org/works/10.1137/19M1242859). There, in the author field, it seems that I. K. is the &quot;first&quot; author, while the two others are &quot;additional&quot; authors. However, &quot;first&quot; does not have to mean &quot;corresponding&quot;, of course.

My second attempt was to download the metadata at Web of Science (full record, tab-limited file). There I found under the column RP (i.e. &quot;Reprint Address&quot;) the information:

Kogan, IA (corresponding author), North Carolina State Univ, Dept Math, Raleigh, NC 27695 USA.