1. Acoustic duct with asymmetric acoustic treatment;Lipstein,1975
2. Acoustic duct with peripherally segmented acoustic treatment;Mani,1976
3. A finite element simulation of sound attenuation in a finite duct with a periphetally varying liner;Watson;NASA TM-74080,1977
4. Transmission in flow ducts with peripherally varying liners;Astley;American Institute of Aeronautics and Astronautics Paper No. 80-1015,1980
5. Noise suppression characteristic of peripherally segmented duct liners;Watson;NASA TP-1904,1981