1-2 of 2 Books

Bäcklund Transformations, the Inverse Scattering Method, Solitons, and Their Applications
By Robert M. Miura

Transformationstheorie der Monge-Ampère'schen partiellen Differentialgleichungen zweiter Ordnung Hr + 2Ks + Lt + M + N(rt - s²
By Walther Arnold Müller