Exact formulation Huygens’ principlein terms ofgeneralized spatiotemporal-dipole secondary sources
[1]B. B. Baker & E.T. Copson, The Mathematical Theory of Huygens’ Principle, 1st Ed., Oxford, 1939; 3rd Ed. (same pagination, with addenda), New York: Chelsea, 19... gutenberg.org/files/14725/14725-h/14725-h.htm. (See also Errata in various editions of Huygens’Treatise on Light atwww.grputland.comorgrputland.blogspot.com, June 20...