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2. Spline approximation of the Cauchy problem (∂p+qu/∂xp ∂yq) = f(x, y, u,...),;Cheung,1968
3. Quasilinear Partial Differential Equations with Inverse-Positive Property;Cheung,1970
4. RS MSUB, linear programming subroutine FORTRAN coded;Clasen,1961