Thapar, R., & Singh, N. B. (2010). Allelopathic influence of leaf residue of <i>Amaranthus spinosus</i> on growth and metabolism of <i>Parthenium hysterophorus</i> L. Ecoprint: An International Journal of Ecology, 12, 77–84. https://doi.org/10.3126/eco.v12i0.3203