Closely Arranged Directional Microphone for Source Separation: Effectiveness in Reduction of the Number of Taps and Preventing Factors. - Yusuke Katayama; Masanori Ito; Allan Kardec Barros; Yoshinori Takeuchi; Tetsuya Matsumoto; Hiroaki Kudo; Noboru Ohnishi; Toshiharu Mukai (ICA, 2004)