Horan02'

@article{DBLP:journals/jot/Horan02,
  author    = {Peter Horan},
  title     = {Eiffel Assertions and the External Structure of Classes
               and Objects},
  journal   = {Journal of Object Technology},
  volume    = {1},
  number    = {4},
  year      = {2002},
  pages     = {105-118},
  ee        = {http://dx.doi.org/10.5381/jot.2002.1.4.a1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}