Acknowledgement
The author, Milan Chandra Roy, is thankful to “UGC Research Fellowship
in Science for Meritorious Students” Ref UGC Letter No. F.4-1/
2006(BSR)/7-13/2007(BSR) under SAP, for sanctioning research
fellowships.
One of the authors, Prof. M. N. Roy is thankful to the University Grant
Commission, New Delhi, and the Government of India for being
awarded one time grant under Basic Scientific Research via the grantin-Aid
No. F.4-10/2010 (BSR) regarding his active service for augmenting
of research facilities to facilitate further research work.