Sharatchandra Singh, Ningombam. Microbiology of azolla-anabaena arollae relationship and their use as biofertilizer for rice cultivation in Manipur / by Ningombam Sharatchandra Singh. - Ph.D. / - Imphal : Manipur University , 2002 - 146p : Subjects--Topical Terms: Biology Dewey Class. No.: G / P2