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April 1941 On the equation ${{dy} \mathord{\left/ {\vphantom {{dy} {dx = f\left( {x,\,y} \right)}}} \right. \kern-\nulldelimiterspace} {dx = f\left( {x,\,y} \right)}}$
André Gleyzal
Bull. Amer. Math. Soc. 47(4): 254-256 (April 1941).
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Vol.47 • No. 4 • April 1941
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