Technological substitution an extended model and its application to the plain paper copier industry - Kho, Luke 1948-; Albarracin, Magdaleno B., Jr. (Quezon City College of Business Administration, University of the Philippines Diliman, 1983)
Thesis (Doctor of Philosophy in Business Administration)--University of the Philippines Diliman
Keywords: Substitution (Technology) -- Mathematical models; Copying machines; Xerography