The 3 references without contexts in paper Lebedev Vladimir Ilich, Лебедев Владимир Ильич (2017) “Экономические аспекты исследования угольных месторождений Улуг-Хемского бассейна (Тува) // Economic aspects of coal deposits exploration of the Ulug-Khem basin (Tuva)” / spz:iplus:atid15:461847

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Lebedev N.I. Mineral resources of Tuva: review and analysis of minerals / Executive editor Doct. of Geol. and Miner. V.I. Lebedev. – Kyzyl: TuvIENR SB RAS, 2012. – P. 284.
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The development strategy of the Russian coal industry in the first decade of the XXI century / A.E. Kontorovich, V.V. Kuleshov etc. – Novosibirsk: Publishing House of SB RAS, Inst. «Geo», 2000. – P. 55. –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– Лебедев Владимир Ильич – д-р геол.-минерал. наук, главный научный со-
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