PINNIS, U.; RUCIŅŠ, Ā.; VILDE, A.; CĒSNIEKS, S. Technical, Economical and Ecological Estimation of Up-To-Date Combined Soil Tillage, Fertilising and Sowing Machines. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 212–217, 2006. DOI: 10.17770/etr2003vol1.2009. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/2009.. Acesso em: 2 may. 2024.