1. Growth inhibition by nicotinic acid in certain root nodule bacteria (Rhizobium spp.);Abdel-Gaffar;Int. Congr. Microbiol. Symp.,1966
2. Experiments in Soil Bacteriology;Allen,1959
3. Genetic transformation of Rhizobium: A review of the work of Balassa, R;Balassa;Bact. Rev.,1963
4. Durch Desoxyribonukleinsäuren induzierte Veränderungen bei Rhizobien;Balassa;Acta Microbiol. Acad. Sci. Hung.,1957
5. Transformation of streptomycin markers in rough strains of Rhizobium lupini. Transformation of streptomycin-dependence;Balassa;Acta Microbiol. Acad. Sci. Hung.,1964