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Calculation of thin-walled structures of variable cross section(Stress analysis of thin walled framed structures of variable cross section by second order differential buckling equations, using matrix method)
THE NEOLITHIC PERIOD IN BULGARIA.(American School of Prehistoric Research. Bulletin no. 16). By JH Gaul. Cambridge, Mass: 1948. pp. xxv and 25 I. PlatesI-LXIX.