Pramila Srivastava Mona Khare Y. K. Srivastava m-Equivalence, entropy and F-dynamical systems. 275-283 2001 121 Fuzzy Sets and Systems 2 http://dx.doi.org/10.1016/S0165-0114(00)00017-8 db/journals/fss/fss121.html#SrivastavaKS01