1. Ein neues Handapplanationstonometer zur Anwendung am liegenden oder sitzenden Patienten.;Draeger;Ber. Deutsch. Ophthal. Ges.,1966
2. Simple hand applanation tonometer for use on the seated as well as on the supine patient.;Draeger;Amer. J. Ophthal.,1966
3. Principle and clinical application of a portable applanation tonometer.;Draeger;Invest. Ophthal.,1967
4. Influence of position on intraocular pressure.;Galin;Amer. J. Ophthal.,1963