| 1 | Petrova M., Tepavicharova M., Dikova L., Vazov R., Grigashkina S.I. Opportunities for the development and improvement of the economic efficiency of personnel in the mining industry (on the example of Bulgaria). Economics and Innovation Management, 2020, no. 4 (15), pp. 80-94. DOI: 10.26730/2587-5574-2020-4-80-94 Rejected 15.01.2021 | MORE INFO | DOWNLOAD |
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