PALACIOS, J. L.; BALTHAZAR, J. M. Â andÂ BRASIL, R. M. L. R. F.. On nonideal and nonlinear portal frame dynamics analysis using bogoliubov averaging method. J. Braz. Soc. Mech. Sci. [online]. 2002, vol.24, n.4, pp.257265.
ISSN 01007386.Â http://dx.doi.org/10.1590/S010073862002000400002.


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