Mauro Aprea Esteban Feuerstein Gustavo Sadovoy Alejandro Strejilevich de Loma 29-42 2009 AAIM http://dx.doi.org/10.1007/978-3-642-02158-9_5 conf/aaim/2009 db/conf/aaim/aaim2009.html#ApreaFSL09