Ivanov, I., Petkov, R. Ecological and Economical Optimization of Locations of Pollution Sources of Underground Waters. 1998 109-114,.
Ivanov, I., Petkov, R. Ecological and Economical Optimization of Locations of Pollution Sources of Underground Waters. 1998 109-114,.
Ivanov, I., Petkov, R. (1998) Ecological and Economical Optimization of Locations of Pollution Sources of Underground Waters, 109-114,.
Ivanov, I., & Petkov, R. (1998). Ecological and Economical Optimization of Locations of Pollution Sources of Underground Waters. Journal of Balkan Ecology, Vol. 1 (N 1), 109-114.
Ivanov I, Petkov R. Ecological and Economical Optimization of Locations of Pollution Sources of Underground Waters. Journal of Balkan Ecology. 1998; Vol. 1(N 1): 109-114.