H. Sakaguchi

A simple method of computing the input quantization and multiplication roundoff errors in a digital filter

S. Mitra, K. Hirano, H. Sakaguchi, 1974 .

Explicit design formulae for digital tan filters with low-pass, high-pass, band-pass, and band- stop characteristics

Sanjit K. Mitra, Kotaro Hirano, S. Mitra, 1979 .