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2. American national psychoacoustical terminology. S3.20;American National Standards Institute,1973
3. Various types of absolute pitch;Bachem;Journal of the Acoustical Society of America,1937
4. The genesis of absolute pitch;Bachem;Journal of the Acoustical Society of America,1940
5. Time factors in relative and absolute pitch determination;Bachem;Journal of the Acoustical Society of America,1954