Reynald Affeldt Naoki Kobayashi Partial Order Reduction for Verification of Spatial Properties of Pi-Calculus Processes. 151-168 2005 128 Electr. Notes Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/j.entcs.2004.11.034 db/journals/entcs/entcs128.html#AffeldtK05