  With Google Scholar, scientists can maintain their publications on personal
profile pages, while the citations to these works are automatically collected
and counted. Maintenance of publications is done manually by the researcher
herself, and involves deleting erroneous ones, merging ones that are the same
but which were not recognized as the same, adding forgotten co-authors, and
correcting titles of papers and venues. The publications are presented on pages
with 20 or 100 papers in the web page interface from 2012--2014. The interface
does not allow a scientist to merge two version of a paper if they appear on
different pages. This not only implies that a scientist who wants to merge
certain subsets of publications will sometimes be unable to do so, but also, we
show in this note that the decision problem to determine if it is possible to
merge given subsets of papers is NP-complete.
