Umirova Dildora 2026. SOLVING THE CAUCHY PROBLEM FOR THE NONLINEAR DIFFUSION EQUATION USING HE’S HOMOTOPY PERTURBATION METHOD. Zamonaviy ilmiy yondashuvlar va texnologik taraqqiyotning ustuvor yo‘nalishlari. 1, 5 (Aug. 2026), 64–68. DOI:https://doi.org/10.5281/zenodo.21892719.