C. Lopez-Molina Humberto Bustince Sola J. Fernández Edurne Barrenechea Tartas Pedro Couto Bernard De Baets A t-Norm Based Approach to Edge Detection. 302-309 2009 IWANN (1) http://dx.doi.org/10.1007/978-3-642-02478-8_38 conf/iwann/2009-1 db/conf/iwann/iwann2009-1.html#Lopez-MolinaSFTCB09