Luis Reynoso Marcela Genero Mario Piattini M. Esperanza Manso Does object coupling really affect the understanding and modifying of OCL expressions? 1721-1727 2006 conf/sac/2006 SAC http://doi.acm.org/10.1145/1141277.1141686 db/conf/sac/sac2006.html#ReynosoGPM06