Geodesic
On the validity of Huygens' principle for second order partial differential equations with four independent variables. Part I : derivation of necessary conditions
Annales de l'I.H.P. Physique théorique, Tome 20 (1974) no. 2, pp. 153-188

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     author = {McLenaghan, R. G.},
     title = {On the validity of {Huygens'} principle for second order partial differential equations with four independent variables. {Part} {I} : derivation of necessary conditions},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {153--188},
     publisher = {Gauthier-Villars},
     volume = {20},
     number = {2},
     year = {1974},
     mrnumber = {361452},
     zbl = {0287.35058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1974__20_2_153_0/}
}
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McLenaghan, R. G. On the validity of Huygens' principle for second order partial differential equations with four independent variables. Part I : derivation of necessary conditions. Annales de l'I.H.P. Physique théorique, Tome 20 (1974) no. 2, pp. 153-188. http://geodesic.mathdoc.fr/item/AIHPA_1974__20_2_153_0/