1
Published 1999
2
3
by Kapur, Ashok
Published 1991
4
Published 1995
5
Published 1996
6
7
by Wirsing, Robert G.
Published 2003
8
9
Published 2003
10
by Chari, P. R.
Published 2003
11
by Shahid M. Amin
Published 2001
12
by Swami, Praveen
Published 2007
13
14
Published 1999
15