(3) Tsuyoshi Takahashi, Makoto Nishida, Yoichi Kageyama, and Hachiro Endo: “Developing a Method to Determine Commodity Location: Shortening Travel Distance of Picking in an Unautomated Warehouse,” Journal of the Institute of Industrial Application Engineers, Vol. 5, No. 4, pp. 164-171, 2017
(4) Wataru Furesawa, Tsuyoshi Takahashi, Yoichi Kageyama, Hachiro Endo, and Noriaki Sato: “Study on a Shipping Slip Assignment Method for Efficiency Improvement of Picking in a Warehouse,” The 7th International Conference on Intelligent Systems and Image Processing \n2019, pp. 336-341, PS-6, 2019