Balla Kovács, A.; Szabó, A.; Bartáné Szabó, E. Studies of the Influences of Different N Fertilizers and Microbion UNC Bacterial Fertilizer on the Nutrient Content of Soil. Acta agrar. Debr. 2010, No. I, 134-140. https://doi.org/10.34101/ACTAAGRAR/I/8391.