Nazarov, M., Velev, N., Mardari, C., Grigorov, B., Georgiev, S., Genova, B. and Vassilev, K. (2022) “Syntaxonomy and Ecology of Petasites Albus, P. Hybridus and P. Kablikianus Phytocoenoses in Bulgaria and Romania”, Proceedings of the Bulgarian Academy of Sciences. Sofia, Bulgaria, 75(1), pp. 43–55. doi: 10.7546/CRABS.2022.01.06.