1. Mirrors, Prisms and Lenses;Southall,1933
2. The Principles of Ophthalmic Lenses;Jalie,1977
3. Mirrors, Prisms and Lenses;Southall,1933
4. On Astigmatism, Part IV;Bannon;Amer. J. Optom. Arch. Amer. Acad. Optom.,1945
5. Computation of Unwanted Sphere and Cylinder in the Periphery of a Spectacle Lens;Fry;Amer. J. Optom. Physiol. Optics,1977