@article{bronts1995unifying,
   author           = {Bronts, Gijsbert H. W. M. and Brouwer, Sid J. and Martens, Christo L. J. and Proper, Henderik A.},
   journal          = {Information Systems},
   number           = {3},
   pages            = {213--235},
   title            = {{A Unifying Object Role Modelling Approach}},
   volume           = {20},
   year             = {1995},
}