ADAMOVIČS, A.; KLĀSENS, V. Symbiotically Fixed Nitrogen in the Soils of Latvia: Possibilities and Problems. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 13–17, 2006. DOI: 10.17770/etr2003vol1.1972. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1972.. Acesso em: 2 may. 2024.