Geodesic
The Konno--Asai--Kakuhata system revisited: Reciprocal transformation and connection to the Kaup--Newell system
Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 7, pp. 163-166.

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We present a chain of changes of variables that transforms a new integrable system found by Konno, Asai, and Kakuhata into a system of three PDEs that consists of the well-known Kaup–Newell system and a scalar first-order linear PDE on the background of the latter. 
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T. Neuwirth. The Konno--Asai--Kakuhata system revisited: Reciprocal transformation and connection to the Kaup--Newell system. Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 7, pp. 163-166. http://geodesic.mathdoc.fr/item/FPM_2006_12_7_a11/

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