20210206221700.0 2160-8830 American journal of operations research (Print) American journal of operations research. American journal of operations research (Print) 2160-8830 2160-8830 2160-8830 California 2160-8830 American journal of operations research. http://www.scirp.org/journal/ajor/ http://bibpurl.oclc.org/web/50122