Long-Term Optimal Delivery Planning for Replacing the Liquefied Petroleum Gas Cylinder. - Akihiro Yoshida; Haruki Sato; Shiori Uchiumi; Nariaki Tateiwa; Daisuke Kataoka; Akira Tanaka; Nozomi Hata; Yosuke Yatsushiro; Ayano Ide; Hiroki Ishikura; Shingo Egi; Miyu Fujii; et al. (CoRR, 2021)