Kadriaj, M. et al. 2026. Shape-Constrained Additive Modelling of Total Petroleum Hydrocarbon Contamination: A Simulation-Based Comparison within a Gamma–Log Framework. Karshi Multidisciplinary International Scientific Journal. 3, 1 (Mar. 2026), 13–33. DOI:https://doi.org/10.22105/kmisj.v3i1.115.