1. The effect of an axial force on the vibration of hinged bars;Woinowsky-Krieger, S.;J. Appl. Mech.,1950
2. The dynamics of the buckling of elastic columns;Hoff, N. J.;J. Appl. Mech.,1951
3. On the non-linear vibration problem of the elastic string;Carrier, G. F.;Quart. Appl. Math.,1945
4. A note on the vibrating string;Carrier, G. F.;Quart. Appl. Math.,1949
5. E. T. Wittaker and G. N. Watson, A course of modern analysis, Cambridge University Press, 1944, pp. 479-480, p. 573.