Pap, Zoltán, Ákos Király, and Krisztiánné Mariann Kis. “Effect of Azotobacter Products on Lettuce Transplants”. Review on Agriculture and Rural Development 2, no. 1 (January 1, 2013): 357–362. Accessed March 15, 2025. https://www.iskolakultura.hu/index.php/rard/article/view/13336.