1. Ashour , S. “ A Comparison Among Different Procedures for the Machine Scheduling Problem ,” presented before the 15th International Meeting of the Institute of Management Sciences , Cleveland , Ohio , September 11–13, 1968 .
2. Ashour , S. “ Combinatorial Analysis of JX.M Sequencing Problems ,” presented before the 34th National Meeting of the Operations Research Society of America , Philadelphia , Pennsylvania , November 6–9, 1968 .