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2.

Comparison of Ni-sensitive and Ni-resistant strains of Nostoc muscorum
by ASTHANA, R. K

World journal of microbiology & biotechnology, 1993, Vol.9 (3), p.323-327

9.

Nitrogen fixation and balance studies of rice soil
by SINGH, A. L

Biology and fertility of soils, 1987, Vol.4 (1-2), p.15-19

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