@article {2018,
	title = {The taxonomy of the Caloplaca citrina group (Teloschistaceae) in the Black Sea region; with contributions to the cryptic species concept in lichenology},
	journal = {Lichenologist},
	volume = {41},
	year = {2009},
	pages = {571-604},
	doi = {10.1017/S0024282909008317},
	author = {Vondr{\'a}k, J. and {\v R}{\'\i}ha, P. and Arup, U. and S{\o}chting, U.}
}
