H. Ejtehadi m.fl. «Ecological study of Betula pendula stands in Hyrcanian forests, North Iran». Acta Botanica Hungarica46 (1–2): 143–151. ISSN1588-2578. doi:10.1556/ABot.46.2004.1-2.10.
G.W. Grimm og T. Denk. «The Colchic region as refuge for relict tree lineages: cryptic speciation in field maples». Turk. J. Bot.38: 1050–1066. ISSN1303-6106. doi:10.3906/bot-1403-87.
H. Ejtehadi m.fl. «Ecological study of Betula pendula stands in Hyrcanian forests, North Iran». Acta Botanica Hungarica46 (1–2): 143–151. ISSN1588-2578. doi:10.1556/ABot.46.2004.1-2.10.
G.W. Grimm og T. Denk. «The Colchic region as refuge for relict tree lineages: cryptic speciation in field maples». Turk. J. Bot.38: 1050–1066. ISSN1303-6106. doi:10.3906/bot-1403-87.