@InProceedings{98,
  title = {N-path digital filters},
  author = {Kazunori Sugahara and K. Hayashi and Koutaro Hirano and S.K. Mitra},
  booktitle = {Memoirs of the faculty of engineering Kobe university},
  number = {30},
  pages = {203--218},
  year = {1983},
  month = {2}
}