@base . a ; . "England" . a , ; "International journal of operational research (Print)" . a ; "1745-7645" ; . a . a ; "1745-7645" ; . a , , ; , , ; "International journal of operational research." ; ; ; ; "1745-7645" ; ; ; "1745-7645" ; ; "1745-7645" ; "International journal of operational research (Print)" , "International journal of operational research." ; . . a ; ; "20160604172200.0"^^ ; ; .