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- [6] NOISE GENERATION AND NOISE ATTENUATION OF DUCT FITTINGS .2. ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS, 1984, 26 (05): : 59 - 59
- [7] Noise reduction .2. Noise reduction with low-pass filter DENKI KAGAKU, 1997, 65 (07): : 550 - 554