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3. Timoshenko, S.P., Soprotivlenie materialov (Strength of Materials), Moscow: Nauka, 1965, vol. 2.
4. Vlasov, V.Z., Izbrannye trudy (Selected Works), Moscow: Izd-vo AN USSR, 1964, vol. 3.
5. Airapetov, E.L., Derzhavets, Yu.A., Bragin, V.V., Nakhatakyan, F.G., et al., FOST Standard no. P 54-285-90, Moscow: VNIINMASh, 1990.