B. P. Pandey, N. Khatri, M. Yadav, K. R. Pant, R. P. Poudel, and A. H. Khan, “Effect of digestate / biogas slurry on wheat under rice – wheat cropping system”, J. Agric. For. Univ., vol. 4, no. 1, pp. 67–75, Oct. 2020.