... Mori¹

Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, JAPAN. email: mori@urban.eng.osaka-cu.ac.jp.

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... Janssen²

European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading RG2 9AX, UK, email: peter.janssen@ecmwf.int.

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... effects³

as remarked in $ 2.1 in the context of the nonlinear Schrödinger equation there is only nonlinear focusing for $k_ph>1.36$

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