Gellerstedt, S. Sur une équation linéaire aux dérivées partielles de type mixte. (French) Zbl 0016.21203 Ark. Mat. Astron. Fys. A 25, No. 29, 1-23 (1937). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 8 Documents Keywords:Differential equations, general theory PDFBibTeX XMLCite \textit{S. Gellerstedt}, Ark. Mat. Astron. Fys. 25, No. 29, 1--23 (1937; Zbl 0016.21203)