Nowaczyk, Kazimierz, et al. “Comparative Spectral Sensitivity and Quantitative Accuracy of X-Ray Fluorescence and Optical Emission Spectroscopy for Alloy Steel Characterization”. Journal of Chemical Learning Innovation, vol. 2, no. 2, Dec. 2025, pp. 253-65, https://doi.org/10.37251/jocli.v2i2.2946.