Сачук, Ю., and О. Максимук. “Contact Problem of the Interaction of Hard Stamps With Elastic Halfplane Surface Protected by Winkler Covering”. PHYSICO-MATHEMATICAL MODELLING AND INFORMATIONAL TECHNOLOGIES, no. 22, Feb. 2019, pp. 117-24, http://fmmit.lviv.ua/index.php/fmmit/article/view/82.