@inproceedings{Holler2009,
  author    = {Anke Holler},
  title     = {Towards an analysis of the adverbial use of German interrogative was ('what')},
  booktitle = {Proceedings of the ... International Conference on Head-Driven Phrase Structure Grammar (HPSG)},
  volume    = {16.2009},
  pages     = {131 -- 149},
  doi       = {10.21248/hpsg.2009.7},
  year      = {2009},
}