@inproceedings{DBLP:conf/acm/LevratHPWA78,
  author    = {Bernard C. Levrat and
               Jurgen Harms and
               Christian Pellegrini and
               Maurice Wenger and
               Robert M. Aiken},
  title     = {An input system designed to aid users of interactive graphics},
  booktitle = {ACM Annual Conference (2)},
  year      = {1978},
  pages     = {720-724},
  ee        = {http://doi.acm.org/10.1145/800178.810116},
  crossref  = {DBLP:conf/acm/1978-2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/acm/1978-2,
  editor    = {Richard H. Austing and
               Dennis M. Conti and
               Gerald L. Engel},
  title     = {Proceedings 1978 ACM Annual Conference, Washington, DC,
               USA, December 4-6, 1978, Volume II},
  booktitle = {ACM Annual Conference (2)},
  publisher = {ACM},
  year      = {1978},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}