MathSciNet bibliographic data MR598750 58A17 (35A30 35Q20 58F07) Crampin, M. Solitons and ${\rm SL}(2,\,{\bf R})$${\rm SL}(2,\,{\bf R})$. Phys. Lett. A 66 (1978), no. 3, 170–172. Article

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