@book {14365,
	title = {Botanicheskie Materialy Gerbariya Botanicheskogo Instituta Imeni V.L.Komarova Adademii Naud SSSR.Leningrad.Leningrad (St.-Petersburg)},
	volume = {21},
	year = {1961},
	author = {N.N.Tzvelev}
}
