@conference{itoh1972characteristics, title = {Characteristics of the Sansui QS Vario-Matrix based on a Psychoacoustic Study of the Localization of Sound Sources in Four-Channel Stereo (Parts I and II)}, author = {Itoh, Ryousuke and Takahashi, Susumu and Nishimaki, Masao and Hirano, Kouichi}, booktitle = {Audio Engineering Society Convention 43}, month = {Sep}, year = {1972}, url = {https://www.aes.org/e-lib/browse.cfm?elib=10260} }