“Symbiotic Activity in Pigeon Pea Inoculated With Wild-Type Hup-, Hup+, and Transconjugant Hup+ Rhizobium”. Tropical Agriculture 71, no. 3 (July 30, 1994). Accessed December 9, 2023. https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/2687.