CVETKOV, Monika, and Anton TAJNŠEK. “Soil Organic Matter Changes According to the Application of Organic and Mineral Fertilizers Within Long-Term Experiments”. Acta Agriculturae Slovenica, vol. 93, no. 3, Sept. 2009, pp. 311–320, https://doi.org/10.14720/aas.2009.93.3.15076.