Hukalov, O. and Gordevskyy, V. 2025. New explicit approximate solution of the Boltzmann equation in the case of the hard sphere model. Ukrains’kyi Matematychnyi Zhurnal. 77, 8 (Sep. 2025), 503–520. DOI:https://doi.org/10.3842/umzh.v77i8.9164.