1. A. Cauchy, ‘Oevres Complétes d’Augustin Cauchy’, ler Sér, Vol II, 167, Gauthier-Villars, Paris (1908).
2. H. C. van de Hulst, ‘Light scattering by small particles’, 110, Dover, New York, 1981.
3. D. J. Brown, E. J. Weatherby and K. Alexander, ‘An experimental study of anomalous diffraction’. To be published.