Golubinova, Irena, Plamen Marinov Serafimov, and Viliana Vasileva. 2020. “Allelopathic Activity of Rhizosphere Soil in Alfalfa - Sorghum Sp. Mixed Growing”. The Indian Journal of Agricultural Sciences 90 (5): 963-67. https://doi.org/10.56093/ijas.v90i5.104372.