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2. 3) E.Dulacska : Explanation of the chapter on stability of the <<Recommendations for Reinforced Concrete Shells and Folded Plates>> and a proposal to its improvement, IASS Bulletin, N0.77, 1981
3. 4) L.Kollar, E.Dulacska : Buckling of Shells for Engineers, A Wiley-Interscience Publication, 1984