Towards a Unifying Object Role Modelling Theory. - S. J. Brouwer; C. L. J. Martens; G. H. W. M. Bronts; Henderik Alex Proper (ORM, 1994)

A unifying object role modelling theory. - G. H. W. M. Bronts; S. J. Brouwer; C. L. J. Martens; Henderik Alex Proper (Inf. Syst., 1995)