@ARTICLE {SANGINGA:1990a, title = {Genetic variability in symbiotic nitrogen fixation within and between provenances of two Casuarina species using the 15N-labelling methods}, author = {Sanginga, N. and Bowen, G. D. and Danso, S. K. A. *}, journal = {Soil Biology and Biochemistry}, year = {1990}, volume = {22}, pages = {539--547}, }