Shiladitya Munshi Nirmalya Sundar Maiti Deepan Ray Debabrata Roy Chowdhury Parimal Pal Chaudhuri An Analytical Framework for Characterizing Restricted Two Dimensional Cellular Automata Evolution. 1383-1402 2007 IICAI db/conf/iicai/iicai2007.html#MunshiMRCC07