@inproceedings{DBLP:conf/coco/MaratheHRS98,
  author    = {Madhav V. Marathe and
               Harry B. Hunt III and
               Daniel J. Rosenkrantz and
               Richard Edwin Stearns},
  title     = {Theory of Periodically Specified Problems: Complexity and
               Approximability},
  booktitle = {IEEE Conference on Computational Complexity},
  year      = {1998},
  pages     = {106-},
  ee        = {http://doi.ieeecomputersociety.org/10.1109/CCC.1998.694596},
  crossref  = {DBLP:conf/coco/1998},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/coco/1998,
  title     = {Proceedings of the 13th Annual IEEE Conference on Computational
               Complexity, Buffalo, New York, USA, June 15-18, 1998},
  booktitle = {IEEE Conference on Computational Complexity},
  publisher = {IEEE Computer Society},
  year      = {1998},
  isbn      = {0-8186-8395-3},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}