Giovanni Pilato Agnese Augello Giorgio Vassallo Salvatore Gaglio Geometric Algebra Rotors for Sub-symbolic Coding of Natural Language Sentences. 42-51 2007 conf/kes/2007-1 KES (1) http://dx.doi.org/10.1007/978-3-540-74819-9_6 db/conf/kes/kes2007-1.html#PilatoAVG07