RobertsonBUM89'

@article{DBLP:journals/ijmms/RobertsonBUM89,
  author    = {David Stuart Robertson and
               Alan Bundy and
               Michael Uschold and
               Robert Muetzelfeldt},
  title     = {The ECO Program Construction System: Ways of Increasing
               its Representational Power and Their Effects on the User
               Interface},
  journal   = {International Journal of Man-Machine Studies},
  volume    = {31},
  number    = {1},
  year      = {1989},
  pages     = {1-26},
  ee        = {http://dx.doi.org/10.1016/0020-7373(89)90030-8},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}