Saikat Mukherjee Srinath Srinivasa Satish Chandra D. 53-67 2008 203 Electr. Notes Theor. Comput. Sci. 3 http://dx.doi.org/10.1016/j.entcs.2008.04.086 db/journals/entcs/entcs203.html#MukherjeeSD08