1. Introduction to Physiological Optics;von Tschermak-Seysenegg,1952
2. A new test for the function of the macula lutea;Goldschmidt;Arch. Ophth.,1950
3. Some ocular phenomena produced with polarized light;Cogan;Arch. Ophth.,1941
4. Personal communication from the American Optical Co., Southbridge, Mass.