- ISSN 0010-0765 printed
- ISSN 1212-6950 electronic
G. Kovačev
- G. Kovačev, K. Ubik, T. Minčeva and R. Nikolov
Paraffinic hydrocarbons from crude oil from northern Bulgaria
1975, Vol. 40, Issue 12, pp. 3728–3730 [Abstract] - G. Kovačev, D. Delova and K. Stránský
Paraffinic hydrocarbons from Devonian, Triassic and Jurassic sediments of Northern Bulgaria
1972, Vol. 37, Issue 12, pp. 4106–4111 [Abstract]
