Distribution map of Acer heldreichii (Balkan maple, Greek maple)
Subspecies:

     Acer heldreichii heldreichii
     Acer heldreichii trautvetteri (syn. A. trautvetteri)
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.19323395
References
Browicz, K., Zieliński, J., 1982. Chorology of trees and shrubs in south-west Asia and adjacent regions, vol. 1. Polish Scientific Publishers, Warszawa, Poznań. ISBN 9788301039288
Meusel, H., Jäger, E. J., Rauschert, S., Weinert, E. (Eds.), 1978. Vergleichende Chorologie der Zentraleuropäischen Flora, Band II. Gustav Fischer Verlag, Jena. ISBN 3334603695
Panjković, B., Pavlović, D., Perić, R., Panić, I., Amidžić, L., 2015. Forests with Greek maple (Acer heldreichii Orph. ex Boiss.) on Mt. Golija (Serbia). Biologia Serbica, 36(1-2).
Stevanović, V. 2013. Distribution of Acer heldreichii. Cartographic database of the endemic flora of the Balkan Peninsula, Faculty of Biology, University of Belgrade. In: Perović, M. R., 2013. Taksonomija i uticaji staništa na karakteristike planinskog javora (Acer heldreichii Orph.) u Srbiji. Ph.D. thesis in Biotechnological sciences, University of Belgrade.
Giovanni Caudullo