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Machkova, M., al., e. .
Study of mountain karst system functioning by tracer techniques.
София: , 2000, p. 24-28.
Machkova, M., al., e. (2000)
Study of mountain karst system functioning by tracer techniques,
София: , p. 24-28
Machkova, M., & al., e.
(2000).
Study of mountain karst system functioning by tracer techniques. (On the example of the Nastan-Trigradska system). Геология и минерални ресурси. София: 7 (9), p. 24-28.