1. Effects of Rhodamine B and Primuline on Bull Spermatozoa and their Use for Fluorimetric Determination of Live/Dead Ratios;Duijn;Mikroskopie,1964
2. Relations entre les caractéristiques du sperme et la fertilité;Duijn;Ann. Biol, anim., Bioch. Biophys.,1965
3. Effects of temperature and light on movement characteristics and longevity of cock spermatozoa;Duijn;Ann. Biol. anim. Bioch. Biophys.,1967
4. Determination of sperm density by means of ultraviolet absorptiometry;Duijn;Proc. Vlth Int. Congr. Reprod. Anim. Insem. Artif., Paris,1968
5. Beziehungen zwischen den Eigenschaften des Samens und der Befruchtungs- fähigkeit;Duijn;Dtsch. tierärztl. Wschr.,1971