"open, university . "
production systems modelling the production environment: / university.. open - 1 ed. - usa : unesco 1972. - ", 109p.; 30 cm."
335 02541 2
338. uni
production systems modelling the production environment: / university.. open - 1 ed. - usa : unesco 1972. - ", 109p.; 30 cm."
335 02541 2
338. uni