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Two papers on natural frequences of continuons beams / A. S. Veletsos, N. M. Newmark Monografia Publication Urbana, Illinois : University of Illinois, 1954 Description p. 143-155 : il. ; 28 cm LocationBiblioteca da UMinho no Campus de Azurém Availability Available (1).

A simple approximation for the natural frequencies of parthy restrained bars / N. M. Newmark, A. S. Veletsos Monografia Publication Urbana, Illinois : University of Illinois, 1952 Description 5 f. : il. ; 28 cm LocationBiblioteca da UMinho no Campus de Azurém Availability Available (1).