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2. Hetényi, M. (1946) Beams on elastic foundation, The University of Michigan Press, Ann Arbor.
3. Pasternak, P.L. (1954) On a new method of analysis of an elastic foundation by means of two foundation constants, Gosudarstvennoe Izdatelstvo Literaturi po Stroitelstuve i Arkhitekture, Moscow (in Russian).
4. Vlasov, V.Z. and Leont'ev, N.N. (1966) Beams, plates and shells on elastic foundations, Israel Program for Scientific Translations, Jerusalem (Translated from Russian; original Russian version published in 1960).
5. Washizu, K. (1975) Variational methods in elasticity and plasticity, Second edition, Pergamon Press.