Open Access
1937 DIE GEOMETRIE DER PARTIELLEN DIFFERENTIALGLEICHUNGEN DRITTER ORDNUNG
Takeo Ohkubo
J. Fac. Sci. Hokkaido Imp. Univ. Ser. I Math. 6(2-3): 113-124 (1937). DOI: 10.14492/hokmj/1531188019
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