COMPUTERS & MATHEMATICS WITH APPLICATIONS, vol. 52, no. 10-11, page. 1511 - 1528, 2006-11
COMPUTERS & MATHEMATICS WITH APPLICATIONS, vol. 34, no. 12, page. 105 - 120, 1997-12
COMPUTERS & MATHEMATICS WITH APPLICATIONS, vol. 33, no. 4, page. 53 - 67, 1997-02