1. Untersuchungen iiber Minimum Perceptibile und Distinktionsvermogen des Auges;Brdndstedt;Acta Ophth.,1935
2. The basis of clinical electroretinography;Karpe;Acta Ophth.,1945
3. Apparatus and method for clinical recording of the electroretinogram;Karpe;Doc. Ophth.,1948a
4. Early diagnosis of siderosis retinae by the use of electroretinography;Karpe;Doc. Ophth.,1948b