Juhász, E. K., and A. Balláné Kovács. “Evaluating Changes in Nitrogen and Sulphur Content in a Soil-Plant System in a Long-Term Fertilization Experiment”. Acta Agraria Debreceniensis, no. 2, Dec. 2020, pp. 77-85, doi:10.34101/ACTAAGRAR/2/3753.