Citation
If you publish research that uses clumpp you have to cite it as follows:
Mattias Jakobsson, Noah A. Rosenberg, CLUMPP: a cluster matching and permutation program for dealing with label switching and multimodality in analysis of population structure, Bioinformatics, Volume 23, Issue 14, July 2007, Pages 1801–1806, https://doi.org/10.1093/bioinformatics/btm233