Boykov, Vasily M., Sergey V. Startsev, and Igor L. Vorotnikov. “Improving the Technology and Primary Tillage Plow”. Amazonia Investiga 8, no. 22 (September 26, 2019): 539–549. Accessed August 7, 2026. https://mail.amazoniainvestiga.info/index.php/amazonia/article/view/795.