- Ganchev, G., S. Mirchev, and T. Chernev. 1983. Biology and ecology of the black spruce bark beetle Hylastes cunicularis . Nauchni Trudove, Vissh Lesotekhnicheski Institut, Sofiya, Gorsko Stopanstvo 27/ 28:197-201.
- Tsankov, G., P. Mirchev, and D. Ovcharov. 1994. Insect pests and their role in silver fir withering and decline in Bulgaria (In Bulgarian). Nauka za Gorata 31:23-33.
- Tsankov, G., P. Mirchev, and H. Tomovsky. 1999. A study on wood eaters and bark beetles in Scots pine ecosystems in Bulgaria. (In Bulgarian, with English summary). Nauka za Gorata (3-4):71-83.