Funding for this research was provided by:
Ministry of Coal Government of India (MT-117 & MT-115/GC 99-07-R)
Article History
Received: 1 January 2018
Accepted: 3 October 2019
First Online: 1 November 2019
Compliance with ethical standards
:
: The views expressed in this paper are those of the authors, and not necessarily of the Institute to which they belong.