Bart Jacobs Jan J. M. M. Rutten Coalgebraic Methods in Computer Science - Foreword. 1 2002 280 Theor. Comput. Sci. 1-2 db/journals/tcs/tcs280.html#JacobsR02 http://dx.doi.org/10.1016/S0304-3975(01)00018-4