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the illustrations and also helped me much in the arrangement of the manuscript.
But, it was Khaidem Binky who has been with me like a shadow helping me
at almost every step since I had started writing the manuscript. The undersigned also wishes to acknowledge the help and cooperation received from
his colleagues, friends, well-wishers and all those benevolent souls connected
with this humble piece of work. Particularly, I would like to mention the name
of Mr. Govinda Datta, proprietor, M/S Jayanti Press, Silchar, who had not
only been giving me encouragements and blessings as my brother-in- law
but also guided me in many aspects of preparation of this piece of work.
Further, contemporary literatures have been consulted with gratitude.
The author utilises this opportunity to express his deep sense of gratitude
to M/S Springer for their acting as a pillar of logistic support and for their
kind efforts in the publication of this humble piece of work.
Silchar
Devashish Kar
The 1st day of October 2012
Acknowledgement