V. S. MEENA, et al. “SOIL MICROBIAL POPULATION AND SELECTED ENZYME ACTIVITIES AS INFLUENCED BY CONCENTRATE MANURE AND INORGANIC FERTILIZER IN ALLUVIUM SOIL OF VARANASI”. The Bioscan, vol. 8, no. 3, May 2013, pp. 931-6, https://thebioscan.com/index.php/pub/article/view/245.