Bifurcation and Symmetry Breaking in Nonlinear Dispersive Waves
Philip G. Saffman and Henry C. Yuen
Phys. Rev. Lett. 44, 1097 (1980) - Published 28 April, 1980
Spin ½ from Gravity
John L. Friedman and Rafael D. Sorkin
Phys. Rev. Lett. 44, 1100 (1980) - Published 28 April, 1980