Before revision:  A semi-analytic solution technique , which only requires a system of ODEs (one is non-linear and the others are linear) to be solved, as well as its error estimate are provided .
After revision:  A semi-analytic solution technique , which only requires a system of ODEs (one is non-linear and the others are linear) to be solved, as well as its error estimate for which we only need to solve essentially a system of linear ODEs .