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4. Bergan, P.G.: Mollestad, E.: “An,Automatic Time-Stepping Algorithmn for Dynamic Problems”, Computer Methods in Applied Mechanics and Engineering, Vol. 49, 1985
5. Bergan, P.G.; Mathisen, K.M.; “Modelling of Hydrostatic Loading and Stability for Coupled Fluid - Structure Problems” In Numerical Methods in Engineering: Theory and Application, edited by J. Middelton, G.N. Pande, Balkema Press, Rotterdam 1985.