Geodesic
A~new hyperbolic equation possessing a~zero-curvature representation
Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 239-241.

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Using a direct procedure to compute a zero-curvature representation (ZCR) we find a previously unknown hyperbolic equation which possesses an sl2-valued ZCR. This ZCR admits no parameter and is not reducible to a proper subalgebra of sl2. 
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M. Pobořil. A~new hyperbolic equation possessing a~zero-curvature representation. Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 239-241. https://geodesic-test.mathdoc.fr/item/FPM_2004_10_1_a10/

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