1. Theoretisches über die Beugung der Röntgenstrahlen (German);Sommerfeld;Z. Math. Phys.,1901
2. Electric Waves;Macdonald,1902
3. Sur la polarisation par diffraction (French);Poincaré;Acta Math.,1892
4. Diffraction of waves by a wedge of any angle;Carslaw;Proc. London Math. Soc.,1919
5. Diffraction by a plane sector;Budaev;Proc. R. Soc. Lond. A,2004