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Parrots (Order Psittaciformes) in the collections of the National Natural History Museum — Sofia

Published in Historia naturalis bulgarica, in 1990, in volume 2, pages 3-6

Studies on the fauna of Trichoptera (Insecta) of Korea. 1. Superfamily Rhyacophiloidea

Published in Historia Naturalis Bulgarica, in 1990, in volume 2, pages 36-60

On the presence and specific position of Pangolins (Gen. Manis L.: Pholidota) in North Mozambique

Published in Historia naturalis bulgarica, in 1990, in volume 2, pages 61-63

Note on the coloration and taxonomical status of the bear (Ursus arctos L., 1758) in Bulgaria

Published in Historia naturalis bulgarica, in 1990, in volume 2, pages 64-66