Comments on "On a misconception involving point collocation and the Rayleigh hypothesis" [with reply]

For original paper (by Christiansen and Kleinman) see IEEE Trans. Antennas Propag., vol.44, p.1309-16 (1996 Oct.). In the study of diffraction and scattering Manenkov suggests that Christiansen and Kleinman have incorrectly interpreted some of the results which they refer to in their references. He discusses various instances. A reply is then given by Christiansen and Kleinman.