équation iconale

[1983] The eikonal equation ; Manfred Schroeder ; The Mathematical Intelligencer 5 (1983) p. 36 [lien]
[1999] Geometric-optical Rays, Poynting's Vector, and Field Momenta ; Masud Mansuripur ; Optics and Photonics News 10 (1999) p. 53 [lien]