1982 With J. Perez. Direct observation of a tangent bifurcation in a nonlinear oscillator. Phys. Lett. A 92:82.
1984 With G. Gibson. Observation of period doubling and chaos in spin-wave instabilities in yttrium iron garnet. Phys. Rev. A 29:811–18.
1985 With R. Van Buskirk. Observations of chaotic dynamics of coupled nonlinear oscillators. Phys. Rev. A 31:3332–57.
1988 With Q. H. Lam, Y. Kim, L. C. Bourne, and A. Zettl. Symmetry breaking and nonlinear electrodynamics in the ceramic superconductor YBa2Cu 3O7. Phys. Rev B. 37:9840–43.
With P. H. Bryant and K. Nakamura. Spinwave dynamics in a ferrimagnetic sphere. Phys. Rev. A 38:4223–40.