1. Aniseikonia;Ludvigh;Am. J. Ophth.,1936
2. Researches in Binocular Vision;Ogle,1950
3. Limits of stereopsis due to physiologic diplopia;Miles;Am. J. Ophth.,1949
4. The psychological significance of the horopter;Glanville;Am. J. Psychol.,1933
5. See the complete bibliography in Ogle's book.