KELBEL, Peter. Gall-wasps (Hymenoptera, Cynipidae) associated with ten oak species in the "Quercetarium" Čifáre. In Folia oecologica. - Zvolen : Institute of Forest Ecology SAS, 2004. ISSN 1336-5266, 2004, vol. 31, no. 2, s. 83-90.