Geodesic
On the validity of Huygens' principle for second order partial differential equations with four independent variables. II. A sixth necessary condition
Annales de l'I.H.P. Physique théorique, Tome 60 (1994) no. 4, pp. 373-432

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partie précédente On the validity of Huygens' principle for second order partial differential equations with four independent variables. Part I : derivation of necessary conditions 
@article{AIHPA_1994__60_4_373_0,
     author = {Anderson, W. G. and McLenaghan, R. G.},
     title = {On the validity of {Huygens'} principle for second order partial differential equations with four independent variables. {II.} {A} sixth necessary condition},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {373--432},
     publisher = {Gauthier-Villars},
     volume = {60},
     number = {4},
     year = {1994},
     mrnumber = {1288586},
     zbl = {0806.35104},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1994__60_4_373_0/}
}
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Anderson, W. G.; McLenaghan, R. G. On the validity of Huygens' principle for second order partial differential equations with four independent variables. II. A sixth necessary condition. Annales de l'I.H.P. Physique théorique, Tome 60 (1994) no. 4, pp. 373-432. http://geodesic.mathdoc.fr/item/AIHPA_1994__60_4_373_0/