ADAMOVIČS, A.; KLĀSENS, V. Symbiotically Fixed Nitrogen in the Soils of Latvia: Possibilities and Problems. ENVIRONMENT. TECHNOLOGY. 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://journals23.rta.lv/index.php/ETR/article/view/1972.. Acesso em: 12 apr. 2025.