Y. Ueno, G. I. Stegeman, and K. Tajima, "Large phase shifts resulting from the X(2) cascading nonlinearity in large walk-off regimes in semiconductors and other dispersive materials,"
in Quantum Electronics and Laser Science Conference, J. Bokor, R. Slusher, P. Bucksbaum, and R. Falcone, eds.,
Vol. 12 of OSA Technical Digest
(Optical Society of America, 1997), paper QThL4.