Kalchev, Rumen Nikolaev Modern Challenges to the Health and Safety at Work in Bulgaria,
Odessa National Econ. Univ., 2013, pp. 60 - 67, ISSN 2313-4569.
Kalchev, Rumen Nikolaev .
Modern Challenges to the Health and Safety at Work in Bulgaria.
Odessa: Odessa National Econ. Univ., 2013, pp. 60 - 67, ISSN 2313-4569.
Kalchev, Rumen Nikolaev (2013)
Modern Challenges to the Health and Safety at Work in Bulgaria,
Odessa: Odessa National Econ. Univ., pp. 60 - 67, ISSN 2313-4569
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