8VANDERVEER N J. Ecological Acoustics: Human Perception of Environmental Sounds[D]. Dissertation Abstracts International, 1979,40/09B,4543.
9RIGAS D I, HOPWOOD D, MEMERY D. Communicating Spa tial Information Via a Multimedia-Auditory Interface[A]. EU ROMICRO Conference 1999 Proceedings 25th. 1999:398-405.