Distribution map of Quercus trojana (Macedonian oak).
     Quercus trojana subsp. trojana
     Quercus trojana subsp. yaltirikii
     Quercus trojana subsp. euboica
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: 10.1016/j.dib.2017.05.007
Data: https://doi.org/10.6084/m9.figshare.5114098
References:

Assyov, B., Petrova, A. (Eds.), 2012. Conspectus Of The Bulgarian Vascular Flora. 4th Edition. Bulgarian Biodiversity Foundation, Sofia.
Bohn, U., Gollub, G., Hettwer, C., Weber, H., Neuhäuslová, Z., Raus, T., Schlüter, H., 2000. Karte der natürlichen Vegetation Europas; Map of the Natural Vegetation of Europe. Landwirtschaftsverlag. ISBN 9783784338095
European Information System on Forest Genetic Resources. EUFGIS database. Accessed in September 2016
Jalas, J., Suominen, J.(Eds.), 1976. Atlas Florae Europaeae: distribution of vascular plants in Europe Vol. 3 Salicaceae to Balanophoraceae. Committee for Mapping the Flora of Europe and Societas Biologica Fennica Vanario, Helsinki.
Phitos, D., Constantinidis, T., Kamari, G. (Eds.), 2009. The red data book of rare and threatened plants of Greece, volume 2 E-Z. Hellenic Botanical Society, Patras. ISBN 9789609407113 (In Greece)
Nikolić, T. (Ed.), 2015. Flora Croatica Database. Faculty of Science, University of Zagreb. Accessed in August 2016.
Zielinski, J., Petrova, A., Tomaszewski, D., 2006. Quercus trojana subsp. yaltirikii (Fagaceae), a new subspecies from southern Turkey. Willdenowia, 36(2): 845-849.
Giovanni Caudullo