Tomoyuki Yamaguchi Shuji Hashimoto Grasping Interface with Photo Sensor for a Musical Instrument. 542-547 2009 HCI (2) http://dx.doi.org/10.1007/978-3-642-02577-8_59 conf/hci/2009-2 db/conf/hci/hci2009-2.html#YamaguchiH09