Landing-sleep and drifting-sleep experiments of the underwater glider for long-term observation - Asakawa, Kenichi; Nakamura, Masahiko; Maeda, Yosaku; Hyakudome, Tadahiro; Ishihara, Yasuhisa (2016 IEEE/OES Autonomous Underwater Vehicles (AUV), Autonomous Underwater Vehicles (AUV), 2016 IEEE/OES, 2016)