1. Über Verwandtschaftsbeziehungen und Konzentrationsverhältnisse bei Viren der Tabak-Ringspot-Gruppe;Bercks;Phytopathol. Z.,1956
2. Zonal separations by density-gradient centrifugation;Brakke;Arch. Biochem. Biophys.,1953
3. Estimation of sedimentation constants of viruses by density-gradient centrifugation;Brakke;Virology,1958
4. A possible association of nematodes with the spread of peach yellow bud mosaic;Breece;Plant Disease Reptr.,1959
5. A negative staining method for high resolution electron microscopy of viruses;Brenner;Biochim. et Biophys. Acta,1959