Olszewska, A.; Barczak, K.; Drewniak, Łukasz; Drewniak, S.; Łobos-Moysa, E.; Zimoch, I.; Maciak, E. Application of Ultraviolet Absorption Spectroscopy for the Determination of Nitrogen Compounds in Anthropogenically Impacted Surface Waters: A Case Study of the Kłodnica River. Opto-Electron. Rev. 2026, 34, 5984.