Himelbrant, Dmitry, Ekaterina Kuznetsova, and Irina Stepanchikova. “Lichenology at the Department of Botany, Saint-Petersburg University”. Biological Communications0, no. 3 (August 26, 2013): 148–166. Accessed February 27, 2020. https://biocomm.spbu.ru/article/view/1372.