no. 2
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'institut Henri Poincaré. Section A, Physique Théorique, Tome 20 (1974) no. 2, pp. 153-188.
complété par Addendum à « R. G. McLenaghan : on the validity of Huygens' principle for second order partial differential equations with four independent variables. I »
complété par Remarque sur « R. G. McLenaghan : on the validity of Huygens principle for second order partial differential equations with four independent variables. I »
partie suivante On the validity of Huygens' principle for second order partial differential equations with four independent variables. II. A sixth necessary condition 
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     title = {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. 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'institut Henri Poincaré. Section A, Physique Théorique, Tome 20 (1974) no. 2, pp. 153-188. http://www.numdam.org/item/AIHPA_1974__20_2_153_0/

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