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'institut Henri Poincaré. Section A, Physique Théorique, Volume 26 (1977) no. 3, p. 323.
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     author = {McLenaghan, R. G.},
     title = {Addendum \`a {\guillemotleft} {R.} {G.} {McLenaghan} : on the validity of {Huygens'} principle for second order partial differential equations with four independent variables. {I} {\guillemotright}},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {323--323},
     publisher = {Gauthier-Villars},
     volume = {26},
     number = {3},
     year = {1977},
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     url = {http://www.numdam.org/item/AIHPA_1977__26_3_323_0/}
}
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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'institut Henri Poincaré. Section A, Physique Théorique, Volume 26 (1977) no. 3, p. 323. http://www.numdam.org/item/AIHPA_1977__26_3_323_0/

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