Lāčgalvis, E., and S. Ivanovs. “Development of Ecological Berries Growing Technologies”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 26, 2006): 150–153. Accessed May 2, 2024. https://journals.rta.lv/index.php/ETR/article/view/2002.