@article {4259,
	title = {A new taxonomy of the Caloplaca citrina group in the Nordic countries, except Iceland},
	journal = {Lichenologist},
	volume = {38},
	year = {2006},
	pages = {1-20},
	issn = {0024-2829},
	doi = {10.1017/S0024282905005402},
	url = {http://www.journals.cambridge.org/abstract_S0024282905005402},
	author = {Arup, U.}
}
@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.}
}
