Spring and autumn phenology of Bulgarian and German provenances of Common beech (Fagus sylvatica L.) under similar climatic conditions
Petkova, Krasimira, Molle, Emil, Huber, Gerhard, Konnert, Monika, Gaviria, Julian
Effects of needle cast diseases on the growth of a 33-year-old Douglas-fir provenance plantation in northwestern Bulgaria
Georgieva, Margarita, Petkova, Krasimira, Molle, Emil