Hiroshi Ohta Hitoshi Saji Hiromasa Nakatani Recognition of facial expressions using muscle-based feature models. 78-88 2000 31 Systems and Computers in Japan 10 http://dx.doi.org/10.1002/1520-684X(200009)31:10<78::AID-SCJ8>3.0.CO;2-E db/journals/scjapan/scjapan31.html#OhtaSN00