VANCHUKHINA, L., 		LEYBERT, T., & 		KHALIKOVA, E.
(2017).
 Methodological Approaches to Evaluation and Analysis of Labor Efficiency in the Spheres of Fuel and Energy Complex.
<em>Journal Of Environmental Management And Tourism, 7</em>(4), 585-594.
doi:10.14505//jemt.v7.4(16).04