Haasis H. Produktions- und Logistikmanagement / H. Haasis, 2008 r=on-line. - Текст : электронный.
Operations research proceedings 2005 : selected papers of the annual international conference of the German operations research society (GOR), Bremen, September 7-9, 2005. / SpringerLink (Online service), 2006 r=on-line. - Текст : электронный.