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It is examined whether the number ($J$) of (joint) publications of a "mainscientist" with her/his coauthors ranked according to rank ($r$) importance,i.e. $ J \propto 1/r $, as found by Ausloos [1] still holds for subfields, i.e.when the "main scientist" has worked on different, sometimes overlapping,subfields. Two cases are studied. It is shown that the law holds for largesubfields. As shown, in an Appendix, is also useful to combine small topicsinto large ones for better statistics. It is observed that the sub-cores aremuch smaller than the overall coauthor core measure. Nevertheless, thesmallness of the core and sub-cores may imply further considerations for theevaluation of team research purposes and activities.

Subfield Effects on the Core of Coauthors