1. Standardization of tonometers. Decennial report by the committee on standardization of tonometers;Friedenwald;Amer. Acad. Ophthal. Otolaryng.,1954
2. Tonometer calibration. An attempt to remove discrepancies found in the 1954 calibration scale for Schiötz tonometers;Friedenwald;Trans. Amer. Acad. Ophthal. Otolaryng.,1957
3. On tonometry 6. Comparative tonometry with the Goldmann applanation tonometer and the Schiötz tonometer in the lying position;Hetland-Eriksen;Acta ophthal. (Kbh.),1966
4. On tonometry 7. The volume of displaced fluid by Schiötz tonometry;Hetland-Eriksen;Acta ophthal. (Kbh.),1966
5. On tonometry 3. Pressure recordings by Schiötz tonometry on living human eyes;Hetland-Eriksen;Acta ophthal. (Kbh.),1966