1. Report on the combined influence of diffraction, various aberrations or variations of the amplitude on image formation;Korringa,1948
2. Transact. Réun. d'Opt.;Zernike,1946
3. Thesis Groningen 1942;Nijboer;Physica,1943
4. Thesis Groningen 1942;Nijboer;Physica,1947