1. Multiple genome relationships in Nicotiana;Kehr;Cornell Univ. Agr. Exp. Sta. Mem.,1952
2. Genetic tumors in Nicotiana hybrids;Kehr;Brookhaven Symposia in Biol.,1954
3. Studies on tumor formation in Nicotiana hybrids. I. The classification of the parents into two etiologically significant groups;Näf;Growth,1958