@InProceedings{icchp00-schweikhardt,
  author = {Schweikhardt, W.},
  title  = {{Requirements on a Mathematical Notation for the Blind}},
  year   = {2000},
  pages  = {663-670},
  booktitle = {{Proceedings of the 7th International Conference on Computers Helping People with Special Needs, ICCHP 2000}},
  editor = {Vollmar, R. and Wagner, R.}
}