P. A. Buah, B. M. A. Rahman, and K. T. V. Grattan, "Soliton switching in an active three-core nonlinear fiber coupler,"
in International Quantum Electronics Conference, J. Shah, C. Weiman, R. Freman, and J. Fujimoto, eds.,
Vol. 9 of OSA Technical Digest
(Optical Society of America, 1994), paper QWC29.