• J.D. Crawford, M. Golubitsky and W.F. Langford. Modulated rotating waves in O(2) mode interactions. Dyn. Stab. Sys. 3 No. 3-4 (1988) 159-175. [Abstract]
• M. Golubitsky and W.F. Langford. Pattern formation and bistability in flow between counterrotating cylinders. Physica D. 32 (1988) 362-392. [Abstract]
• W.F. Langford, R. Tagg, E. Kostelich, H.L. Swinney and M. Golubitsky. Primary instability and bicriticality in flow between counterrotating cylinders. Phys. Fluids. 31 (4) (1988) 776-785. [Abstract] [PDF 1.7M]
• M. Golubitsky and W.F. Langford. Classification and unfoldings of degenerate Hopf bifurcation. J. Diff. Eqns. 41 (1981) 375-415. [Abstract]