R.A. JAT and I.P.S. AHLAWAT, “Effect of organic manure and sulphur fertilization in pigeonpea (Cajanus cajan) + groundnut (Arachis hypogaea) intercropping system”, IJA, vol. 55, no. 4, pp. 276–281, Oct. 2001, doi: 10.59797/ija.v55i4.4763.