Andreas Zendler Till Pfeiffer Michael Eicks Franz Lehner Experimental comparison of coarse-grained concepts in UML, OML, and TOS. 21-30 2001 57 Journal of Systems and Software 1 http://dx.doi.org/10.1016/S0164-1212(00)00114-X db/journals/jss/jss57.html#ZendlerPEL01