Geodesic
Addendum à « R. G. McLenaghan : on the validity of Huygens' principle for second order partial differential equations with four independent variables. I »
Annales de l'I.H.P. Physique théorique, Tome 26 (1977) no. 3, p. 323.

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complète On the validity of Huygens' principle for second order partial differential equations with four independent variables. Part I : derivation of necessary conditions 
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McLenaghan, R. G. Addendum à « R. G. McLenaghan : on the validity of Huygens' principle for second order partial differential equations with four independent variables. I ». Annales de l'I.H.P. Physique théorique, Tome 26 (1977) no. 3, p. 323. http://geodesic.mathdoc.fr/item/AIHPA_1977__26_3_323_0/

[1] S. Helgason, Ann. Inst. Henri Poincaré, Vol. XXI, no. 4, 1974, p. 347. | Zbl | MR | mathdoc-id