@inproceedings{Seidl85quadratic,
  author = {Helmut Seidl},
  title = {A quadratic regularity test for non-deleting macro {S} grammars},
  booktitle = {Fundamentals of Computation Theory},
  editor = {Lothar Budach},
  month = {September},
  year = 1985,
  pages = {422-430},
  series = {Lecture Notes in Computer Science},
  volume = {199},
  publisher = {Springer},
  address = {Cottbus, Germany},
}