Remarque sur « R. G. McLenaghan : on the validity of Huygens principle for second order partial differential equations with four independent variables. I »
Helgason, Sigurdur
Annales de l'I.H.P. Physique théorique, Tome 21 (1974), p. 347 / Harvested from Numdam
Access to full text
Full (PDF)
Full (DJVU) 
@article{AIHPA_1974__21_4_347_0,
     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},
     volume = {21},
     year = {1974},
     pages = {347-347},
     mrnumber = {369926},
     zbl = {0304.35063},
     language = {en},
     url = {http://dml.mathdoc.fr/item/AIHPA_1974__21_4_347_0}
}

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) p. 347. http://gdmltest.u-ga.fr/item/AIHPA_1974__21_4_347_0/