1. Foughner, J. T., and Alexander, W. C. "Wind-Tunnel Tests of Modified Cross, Hemisflo, and Disk-Gap-Band Parachuteswith Emphasis inthe TransonicRange,"NASA TND-7759,1974.
2. Zell,P.T."PerformanceandTestSectionFlowCharacteristicsoftheNationalFull-ScaleAerodynamicsComplex 80-by-120 FootWind Tunnel,"NASA TM103920,1993.