We now present an account of the numerical applications of the methods presented so far. However, we present adequate references so that one can have easy access to reviews and original works on these topics [1][2][3][4][5][6][7][8][9].All these methods involve the solution of a linear set of algebraic
255Variational Principles and the Numerical Solution of Scattering Problems. Hence, it is not possible to present an account of all of them.