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Ediger, Volkan S., Berk, Istemi 
ORCID: 0000-0003-3507-2293 and Ersoy, Mucella
(2015).
An assessment of mining efficiency in Turkish lignite industry.
Resour. Policy, 45.
S. 44 - 52.
OXFORD:
ELSEVIER SCI LTD.
ISSN 1873-7641