Tae-Heon Yang Dongbum Pyo Sang-Youn Kim Young-Jun Cho Yu Dong Bae Young Min Lee Jeong Seok Lee Eun Hwa Lee Dong-Soo Kwon A new subminiature impact actuator for mobile devices. 95-100 2011 World Haptics http://dx.doi.org/10.1109/WHC.2011.5945468 conf/haptics/2011 db/conf/haptics/whc2011.html#YangPKCBLLLK11