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Generation and tooth contact analysis of spiral bevel gears with predesigned parabolic functions of

Litvin, F. L. (Faydor L.)
[Washington, D.C.] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ; [Springfield, Va. : For sale by the National Technical Information Service], 1989. 1989

Theory of biaxial graded-index optical fiber

Kawalko, Stephen F., author.
[Washington, D.C.] : National Aeronautics and Space Administration, [1990] 1990

Theory of circular dielectric waveguide with anisotropic sheet cover

Kish, J. T.
Chicago, Ill. : University of Illinois at Chicago ; [Washington, D.C. : National Aeronautics and Space Administration], 1990. 1990