December 22, 2014 "SCHAEFER CASE PICKING - Automatic selection and palletization of mixed full-case orders" (PDF). ssi-schaefer.de.
Ngày 22 tháng 12 năm 2014 ^ “SCHAEFER CASE PICKING - Automatic selection and palletization of mixed full-case orders” (PDF). ssi-schaefer.de.  ^ “Schaefer Case Picking”.