McLenaghan, R. G. Huygens’ principle. (English) Zbl 0528.35057 Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 37, 211-236 (1982). MSC: 35L10 35B30 PDFBibTeX XMLCite \textit{R. G. McLenaghan}, Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 37, 211--236 (1982; Zbl 0528.35057) Full Text: Numdam EuDML
McLenaghan, R. G. Addendum: On the validity of Huygens’ principle for second order partial differential equations with four independent variables. (English) Zbl 0344.35053 Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 26, 323 (1977). MSC: 35L05 PDFBibTeX XMLCite \textit{R. G. McLenaghan}, Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 26, 323 (1977; Zbl 0344.35053) Full Text: EuDML
McLenaghan, R. G. On the validity of Huygens’ principle for second order partial differential equations with four independent variables. I: Derivation of necessary conditions. (English) Zbl 0287.35058 Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 20, 153-188 (1974). MSC: 35L10 35B99 PDFBibTeX XMLCite \textit{R. G. McLenaghan}, Ann. Inst. Henri Poincaré, Nouv. Sér., Sect. A 20, 153--188 (1974; Zbl 0287.35058) Full Text: Numdam EuDML