Durand, S. ., and A. . Combescure. “Analytical Andnumerical Study of the Bifurcation of a Cylindrical Bar under Uniaxial Tension”. European Journal of Computational Mechanics, vol. 8, no. 7, July 1999, pp. 725-4, https://journals.riverpublishers.com/index.php/EJCM/article/view/2977.