1. The Inverse Scattering Transform-Fourier Analysis for Nonlinear Problems
2. Finsler Geometry, Relativity and Gauge Theories;Asanov,1985
3. Les espaces metrique fondés sur la notion d'aire;Cartan,1933
4. Solitons and Nonlinear Wave Equations;Dodd,1985
5. Solitons, Mathematical Methods for Physicists;Eilenberger,1981