The Cusp-hopf bifurcation. - John Harlim; William F. Langford (Int. J. Bifurc. Chaos, 2007)

Hysteresis in a Rotating Differentially Heated Spherical Shell of Boussinesq Fluid. - Gregory M. Lewis; William F. Langford (SIAM J. Appl. Dyn. Syst., 2008)

Double Hopf Bifurcation with Huygens Symmetry. - Petko M. Kitanov; William F. Langford; Allan R. Willms (SIAM J. Appl. Dyn. Syst., 2013)

Topological Climate Change. - Kolja L. Kypke; William F. Langford (Int. J. Bifurc. Chaos, 2020)