Volume 4, Issue 2 and 3, July 2002, Pages 51-61
M.K. Shrimali; R.S. Jangid
Volume 3, Issue 1, July 2001, Pages 13-22
Abhijit K. Agrawal; T.K. Datta
Volume 2, Issue 1, October 1999, Pages 35-46
)