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P. Dumitrache, “On the stresses and deflections calculus in bending the cylindrical naturally twisted bars, with constant pitch”, Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, vol. 18, no. 2, pp. 23-26, Nov. 2011.