Dabovsky, H., Ognyanov, R., Kostova, T. Oil and natural gas in Bulgaria - three points of views,
, 1994, p. 54-57.
Dabovsky, H., Ognyanov, R., Kostova, T. .
Oil and natural gas in Bulgaria - three points of views.
София: , 1994, p. 54-57.
Dabovsky, H., Ognyanov, R., Kostova, T. (1994)
Oil and natural gas in Bulgaria - three points of views,
София: , p. 54-57
Dabovsky, H.,
Ognyanov, R., &
Kostova, T.
(1994).
Oil and natural gas in Bulgaria - three points of views. Геология и минерални ресурси. София: 1 (1), p. 54-57.