@article{DeKuthyMeurers2003,
  author    = {Kordula De Kuthy and W. Detmar Meurers},
  title     = {Dealing with optional complements in HPSG-based grammar implementations},
  journal   = {Proceedings of the ... International Conference on Head-Driven Phrase Structure Grammar (HPSG)},
  volume    = {10.2003},
  number    = {1},
  pages     = {88 -- 96},
  doi       = {10.21248/hpsg.2003.5},
  year      = {2003},
}