Serģe, I., Biteniece, G., Teliševa, G., Ļebedeva, G., & Lielpētere, A. (2006). Application of Lignosilicon and Azobacterine for Biological Agriculture. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, 1, 238-243. https://doi.org/10.17770/etr2003vol1.2012