Khapugin, A.A. et al. 2016. Populations of Orchis militaris, Epipactis palustris and Malaxis monophyllos in the Republic of Mordovia (Central Russia). Biodiversity: Research and Conservation. 42, (Nov. 2016), 33–40. DOI:https://doi.org/10.1515/biorc-2016-0012.