... Hepp, Z¨urich, SwitzerlandW. Hillebrandt, Garching, GermanyD. Imboden, Z¨urich, Switzerland R. L. Jaffe, Cambridge, MA, USA R. Lipowsky, Golm, GermanyH. v. L¨ohneysen, Karlsruhe, GermanyI. ... Ojima, Kyoto, JapanD. Sornette, Nice, France, and Los Angeles, CA, USAS. Theisen, Golm, GermanyW. Weise, Trento, Italy, and Garching, GermanyJ. Wess, M¨unchen, GermanyJ. Zittartz, K¨oln, ... rectangular matrices of respective orders (m, n) and (n, m ), and (i, a, b) constants, admits the zero-curvature representation ([83]Eq. ( 5)) (∂x− L)ψ = 0, (∂t− M)ψ = 0, (3 6) L = aP + λG, M =(−aGP2+...