1. Biochemical and symbiotic properties of the rhizobia;Allen;Bact. Rev.,1950
2. Vitamin requirements of root nodule bacteria;Graham;J. Gen. Microbiol.,1963
3. Physiological variation and host plant specificity of rhizobia isolated from Caragana arborescens;Gregory;Canad. J. Bot.,1953
4. Reactions de la plante hôte avec les Rhizobium du groupe Lotus- Anthyllis;Jensen;Ann. Inst. Pasteur,1963
5. On the relation between hosts and root nodule bacteria in certain leguminous plants. (Danish with English summary);Jensen;Tidsskr. Planteavl,1964