some papers from science direct(1989) pleas

1-Mathematical modelling and computer simulation of industrial water–gas shift converters
Mathematical and Computer Modelling, Volume 12, Issue 8, 1989, Pages 1017-1034
S. S. E. H. Elnashaie, F. M. Alhabdan
2-Erratum to “The vital role of mathematical modelling in chemical engineering education”
Mathematical and Computer Modelling, Volume 19, Issue 5, March 1994, Page 115
S. S. E. H. Elnashaie, F. M. Alhabdan, S. S. Elshishini
3-A computer software package for the simulation and optimization of an industrial ammonia converter based on a rigorous heterogeneous model
Mathematical and Computer Modelling, Volume 12, Issue 12, 1989, Pages 1589-1600
S. S. E. H. Elnashaie, F. M. Alhabdan

لينك 1:
http://rapidshare.com/files/115785823/MATHEMATICAL_MODELLING.pdf.html
لينك 2:
http://rapidshare.com/files/115786079/Erratum.pdf.html
لينك 3:
http://rapidshare.com/files/115786358/A_COMPUTER_SOFTWARE.pdf.html