I. K., Ahmedova, et al. “Oxidation of Brown Coals With Hydrogen Peroxide in the Presence of Oxalic Acid for the Subsequent Production of Humic Soil Improver For Degraded Soils”. Excellencia: International Multi-Disciplinary Journal of Education (2994-9521), vol. 2, no. 10, Oct. 2024, pp. 174-80, https://doi.org/10.5281/.