APPLIED MATHEMATICS AND COMPUTATION, vol. 104, no. 1, page. 1 - 14, 1999-09-01
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