@base . a . a , , ; , , ; "American journal of operations research." ; ; ; ; "2160-8830" ; ; ; "2160-8830" ; ; "2160-8830" ; "American journal of operations research (Print)" , "American journal of operations research." ; ; "http://www.scirp.org/journal/ajor/" , "http://bibpurl.oclc.org/web/50122" . . a ; . a , ; "American journal of operations research (Print)" . a ; "2160-8830" ; . a ; "2160-8830" ; . "California" . a ; ; "20210206221700.0"^^ ; ; .