1. Proceedings of a symposium on acoustical duct treatments for aircraft,1970
2. National Aeronautics and Space Administration, Report SP-189,1968
3. National Aeronautics and Space Administration, Report SP-200,1968
4. Acoustic lining concepts and materials for engine ducts;Mangiarotty;Journal of the Acoustical Society of America,1970
5. Parametric studies of the acoustic behaviour of duct lining materials;Atvars;Journal of the Acoustical Society of America,1970