1. Effect of the soil moisture on the transpiration and photosynthesis of samplings from oaks from Rila and Strandzha mountains;Arabov;For. Sci.,1986
2. Arabov, A., 1986b. Comparative studies into the Rila Oak (Quercus protoroburoides J. D. et B. B) and Strandzha Oak (Quercus armeniaca Kotschy var. stranjensis (Turrill) (Ph.D. thesis), University of Forestry, Sofia, 198, (in Bulgarian, unpublished).
3. Arabov, A., 1987. Growth of the Quercus protoroburoides J. D. et B. and Quercus hartwissiana Stev. seedlings in the different altitude and soil substratum. In: Kuzmanov, B., (Ed.), Proceedings of Fourth National Conference of Botany, 22–26 August, 1987, Sofia, Bulgaria, 3, 77–84 (in Bulgarian).
4. Population structure of the oak from Rila and Strandzha Mountains according to the features of the generative organs;Arabov;For. Sci.,1988
5. Investigating the population structure of Rila and Strandja oak by the morphological character of their leaves;Arabov;For. Sci.,1985