R. J. S. Pedersen, B. Mikkelsen, B. F. Jørgensen, M. Nissov, K. E. Stubkjaer, K. Wünstel, K. Daub, E. Lach, G. Laube, W. Idler, M. Schilling, P. Doussiere, and F. Pommerau, "WDM cross-connect cascade based on all-optical wavelength converters for routing and wavelength slot interchanging using a reduced number of internal wavelengths,"
in Optical Fiber Communication Conference,
Vol. 2 of 1998 OSA Technical Digest Series
(Optical Society of America, 1998), paper TuJ2.