On the stresses and deflections calculus in bending the cylindrical naturally twisted bars, with constant pitch - Dumitrache, Petru (Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 2011)