Paudyal, S., Aryal, R. R., Chauhan, S. and Maheshwari, D. (2010) “Effect of Heavy Metals on Growth of Rhizobium Strains and Symbiotic Efficiency of Two Species of Tropical Legumes”, Scientific World, 5(5), pp. 27–32. doi: 10.3126/sw.v5i5.2652.