Chigrinets Viktor Petrovich. Actual state and perspectives of English oak standing forest seed base development in Sumy region : к.с.-г.н. : spec.. 06.03.01 - Лісові культури, селекція, насінництво : presented. 2006-04-26; popup.evolution: .; Ukrainian scientific research institute of forestry and forest melioration named after G.M. Vysotsky. – , 0406U001916.

Updated: 2026-11-02