  We report on an exploratory analysis of the forms of plagiarism observable in
mathematical publications, which we identified by investigating editorial notes
from zbMATH. While most cases we encountered were simple copies of earlier
work, we also identified several forms of disguised plagiarism. We investigated
11 cases in detail and evaluate how current plagiarism detection systems
perform in identifying these cases. Moreover, we describe the steps required to
discover these and potentially undiscovered cases in the future.
