Masaki Iwabuchi Yasuaki Kakehi Takeshi Naemura LimpiDual touch: interactive limpid display with dual-sided touch sensing. 87 2008 SIGGRAPH Posters http://doi.acm.org/10.1145/1400885.1400978 conf/siggraph/2008posters db/conf/siggraph/siggraph2008posters.html#IwabuchiKN08