@inproceedings{DBLP:conf/ima-ms/Hagen92,
  author    = {Hans Hagen},
  title     = {Variational Principles in Curve and Surface Design},
  booktitle = {IMA Conference on the Mathematics of Surfaces},
  year      = {1992},
  pages     = {169-190},
  crossref  = {DBLP:conf/ima-ms/1992},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/ima-ms/1992,
  editor    = {Robert B. Fisher},
  title     = {Proceedings of the 5th IMA Conference on the Mathematics
               of Surfaces, Edinburgh, September 14-16, 1992},
  booktitle = {IMA Conference on the Mathematics of Surfaces},
  publisher = {Clarendon Press},
  year      = {1994},
  isbn      = {0-19-853483-3},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}