WittrickW. H.WilliamsF. W., ‘A general algorithm for computing natural frequencies of elastic structures’. Q. J. Mech. Appl. Math., 1971, XXIV, 263–284.
2.
BishopR. E. D.JohnsonD. C., The Mechanics of Vibration, 1960 (Cambridge University Press) p. 455.
3.
GrassieS. L.GregoryR. W.JohnsonK. L., ‘The behaviour of railway wheelsets and truck at high frequencies of excitation’, J. mech. Engng Sci., 1982, 24, 103–111 (this issue).