L. Daschievici and D. Ghelase, “Optimization and control of the operation level in the manufacturing system”, Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, vol. 21, no. 1, pp. 17-20, Jun. 2014.