Kazuhide Fukushima Shinsaku Kiyomoto Toshiaki Tanaka Kouichi Sakurai Ternary Subset Difference Method and Its Quantitative Analysis. 225-239 2008 WISA http://dx.doi.org/10.1007/978-3-642-00306-6_17 conf/wisa/2008 db/conf/wisa/wisa2008.html#FukushimaKTS08