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1973On the theorem of Cauchy-Kowalevsky for first order linear differential equations with degenerate principal symbols
Proc. Japan Acad. 49(2): 83-87 (1973). DOI: 10.3792/pja/1195519428
Toshio Oshima "On the theorem of Cauchy-Kowalevsky for first order linear differential equations with degenerate principal symbols," Proceedings of the Japan Academy, Proc. Japan Acad. 49(2), 83-87, (1973)