Kumari, Erik:
CONTRIBUTIONS OF RUSSIAN AND SOVIET ORNITHOLOGISTS TO PALEARCTIC TO PALEARCTIC ZOOGEOGRAPHY : Peper rend st the Internationel Ornithologicel Congress, Moscow, August 1982 / Erik Kumari . Hrsg.: Academy of Sciences of the Estonian SSR, Department of Chemistry, Geology and Biology. - Tallinn : "Valgus", 1982. - 47 S.