general methods for quasilinear system of ODE's ??? I am studying a system of ODE's of the following type: dh/dx = H(h,g) dg/dx = G(h,g) The unknown functions are h(x) and g(x). The equations are nonlinear ODE's because H and G are quadratic polynomials of h and g, containing terms like h^2, hg, g^2, h^0, g^0 with some numeric coefficients. The sytem is quasilinear because the equations are linear in the derivatives. Are there general methods to obtain the general solution of such a system?