Simulation based operational analysis of future space transportation systems. - Alex J. Ruiz-Torres; Edgar Zapata (WSC, 2000)

Earth to orbit logistics and supply chain modeling and simulation for NASA exploration systems. - Mohamed Fayez; Dayana Cope; Assem Kaylani; Mike Callinan; Edgar Zapata; Mansooreh Mollaghasemi (WSC, 2006)

Knowledge based representation and operations assessment of space transportation system architectures. - Alex J. Ruiz-Torres; Edgar Zapata; Kazuo Nakatani; Marcella L. Cowen (Knowl. Based Syst., 2006)