- Zasev, B. 1952a. Merki za borba srestu vachovija korojad (Ips acuminatus Gyll.) pri uslovijata u mas [Control of Ips acuminatus under Bulgarian conditions] . Nauc Trud lesoteh Fak. selkostopan Adad., Sofia 1:109-120.
- Zasev, B. 1952b. Novi nasekomni vredi teli po gorskite darveta i hrasti v Balgarija [New insect pests of forest trees and shrubs in Bulgaria]. Nauc. Trud. lesoteh. Fak. selskostopan. Akad., Sofia 1:121-128.