Masking

Bilger, R.C. and I.J. Hirsh, Masking of Tones by Bands of Noise, J. Acous. Soc. Am., Vol. 28, No. 4 (July 1956) pp. 623-630.

Fletcher, H., Loudness, Masking, and Their Relation to the Hearing Process and the Problem of Noise Measurement, J. Acous. Soc. Am., Vol. 9 (April 1938) pp. 275-293. Historically important in development of the critical band concept.

Small, Arnold M., Pure Tone Masking, J. Acous. Soc. Am., Vol. 31, No. 12 (Dec. 1959) pp. 1619-1625.