Submitted on: 31 December 1998.
Revised on: 17 April 1999.
Accepted on: 03 June 1999.
___________________Journal of the Pakistan Institute of Chemical Engineers
http://reply.papertrans.cn/2/199/19823/19823-32.png
Submitted on: 07 April 2020.
Revised on: 15 July 2020.
Accepted on: 31 July 2020.
___________________Journal of the Pakistan Institute of Chemical Engineers
Submitted on: 12 April 2002.
Revised on: 26 June 2002.
Accepted on: 03 August 2002.
___________________Journal of the Pakistan Institute of Chemical Engineers
Submitted on: 14 September 2008.
Revised on: 07 January 2009.
Accepted on: 20 February 2009.
___________________Journal of the Pakistan Institute of Chemical Engineers
Submitted on: 09 October 2020.
Revised on: 05 December 2020.
Accepted on: 19 December 2020.
___________________Journal of the Pakistan Institute of Chemical Engineers