@Article{49,
  title = {Design of Digital Bandpass / Bandstop Filters with Independent Tuning Characteristics},
  author = {S.K. Mitra and Koutaro Hirano and S. Nishimura and Kazunori Sugahara},
  journal = {FREQUENZ},
  volume = {44},
  number = {3-4},
  pages = {117--121},
  year = {1990},
  month = {4}
}