A. Bachem

Tone height and tone chroma as two different pitch qualities.

A. Bachem, A. Bachem, 1950 .

Time Factors in Relative and Absolute Pitch Determination

A. Bachem, A. Bachem, 1954 .

The Genesis of Absolute Pitch

A. Bachem, A. Bachem, 1940 .

Various Types of Absolute Pitch

A. Bachem, A. Bachem, 1937 .