1. Calibration of microphones;ANSI Standard S.1.10,1966
2. Mikrophon-Prüfverfahren, Messbedingungen und Messverfahren für Typprüfungen;DIN Standard 45591,1971
3. Radiating systems: speech emission directivity;Moreno,1974
4. New results on the human head directivity in speech emission;Moreno,1977
5. Level anamorphical relationships as a new secondary method for transducer calibration and related problems;Pfretzschner,1977