Reference

Bazyli Czeczuga, I. F. Skirina, C. B. Maximov (1989): Investigations on Carotinoids in Lichens. XIX. Carotinoids in Lichens of the Tundra of Kamchatka Region (Far East). – Phyton, Annales Rei Botanicae, Horn – 29_1: 7 - 13.