2) M.P. KOWLTON and A.F. WOJCIECHOWICZ: Model Studies of the Forward Flight Characteristics of the P-GEM, Princeton University Report No.581, Dec. 1961.
3) R. MURAO and H. BAUMAN: Aerodynamic Characteristics of an Air Cushion Vehicle Model, Proceedings of the Thirteenth Japan National Congress for Applied Mechanics, 1963.