1. A new instrument for measuring heterophoria and the combining power of the eyes;Verhoeff;Bull. Johns Hopkins Hosp.,1899
2. A description of the reflecting phorometer, and a discussion of the possibilities concerning torsion of the eyes;Verhoeff;Tr. Am. Ophth. Soc.,1899
3. Cycloduction;Verhoeff;Tr. Am. Ophth. Soc.,1934
4. Ueber die der Wilkür entzogenen Fusionsbewegungen der Augen;Hofman;Arch. f. d. ges Physiol.,1900
5. Shadow images on the retina;Verhoeff;Psychological Rev.,1900