Liu, Ruilong Nodulating Competitiveness of a Nonmotile Tn7 Mutant of Bradyrhizobium japonicum in Nonsterile Soil. [electronic resource] - Applied and environmental microbiology Aug 1989 - 1895-1900 p. digital Publication Type: Journal Article ISSN: 1098-5336 Standard No.: 10.1128/aem.55.8.1895-1900.1989 doi