1. Department of Civil Engineering, Faculty of Engineering, Monash University, Clayton, Melbourne, Victoria 3800, Australia
2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
3. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
4. Coal Petrology Section, Resource Quality Assessment Division, CSIR-Central Institute of Mining and Fuel Research, Digwadih Campus, Dhanbad 828132, India
5. Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad 500046, India