Funding for this research was provided by:
Ministry of Earth Sciences (MM/SERP/Univ-Allahabad/2013/IND-6/002)
Department of Science and Technology, Government of India (EMR/2015/000861)
United States - India Educational Foundation
Abdus Salam International Centre for Theoretical Physics
Article History
Received: 18 April 2017
Accepted: 2 February 2018
First Online: 14 February 2018