Lefort, G. (1964). Algebra and analysis: Problems and solutions. North-Holland Publishing.
Lua i Stíl Chicago (17ú heag.)Lefort, G. Algebra and Analysis: Problems and Solutions. Amsterdam: North-Holland Publishing, 1964.
Lua MLA (9ú heag.)Lefort, G. Algebra and Analysis: Problems and Solutions. North-Holland Publishing, 1964.
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