1. Aural Detection and Identification ofthe Presence ofPersonnel;BLACK, J.W.,1958
2. BROADBENT, D. E. (1958). J. acoust. Soc. Amer. 30, 824.
3. BURNS, W. (1965). Trans. Ass. industr. med. offrs. 15,2.
4. Noise and Man;BURNS, W.,1968
5. COLLINS, E. G. (1948). J. Laryng. 62, 358..