Simple method of calculating the critical indices in the $1/n$ expansion

A method is proposed for calculating critical indices based on the skeleton equations for the propagators; it yields equations for the indices of the type of self-consistent field equations. When these equations are iterated, the usual $1/n$ expansion of the indices is obtained. The method makes it possible to calculate the indices $\eta$ and $\nu$ in the order $1/n^2$ for any number of dimensions.