1. P. I. Klubin, "Distribution of contact pressures between a static-load test-plate with an uneven underside and an elastic foundation base," Osnovaniya, Fundamenty i Mekhan. Gruntov, No. 5 (1968).
2. I. Ya. Shtaerman, The Contact Problem in the Theory of Elasticity [in Russian], Gostekhizdat, Moscow (1949).