Lin, Po-YangPo-YangLinShieh, Win-BinWin-BinShiehDAR-ZEN CHEN2021-11-042021-11-042008https://scholars.lib.ntu.edu.tw/handle/123456789/586299新竹, 台灣A Gravity-Balanced Spatial Positioning Articulated Robotic Arm with Minimal Number of Zero-Free-Length Springsconference paper