Maria Carolina Vanegas Isabelle Bloch Henri Maître Jordi Inglada Approximate Parallelism between Fuzzy Objects: Some Definitions. 12-19 2009 WILF http://dx.doi.org/10.1007/978-3-642-02282-1_2 conf/wilf/2009 db/conf/wilf/wilf2009.html#VanegasBMI09