Wall contact by octo-rotor UAV with one DoF manipulator for bridge inspection. - Takahiro Ikeda; Shogo Yasui; Motoharu Fujihara; Kenichi Ohara; Satoshi Ashizawa; Akihiko Ichikawa; Akihisa Okino; Takeo Oomichi; Toshio Fukuda (IROS, 2017)