Geodesic
Remarque sur « 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 21 (1974) no. 4, p. 347.

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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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     author = {Helgason, Sigurdur},
     title = {Remarque sur {\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'I.H.P. Physique th\'eorique},
     pages = {347--347},
     publisher = {Gauthier-Villars},
     volume = {21},
     number = {4},
     year = {1974},
     mrnumber = {369926},
     zbl = {0304.35063},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1974__21_4_347_0/}
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Helgason, Sigurdur. Remarque sur « 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 21 (1974) no. 4, p. 347. http://geodesic.mathdoc.fr/item/AIHPA_1974__21_4_347_0/