Lefort, G. (1964). Algebra and analysis: Problems and solutions. North-Holland Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLefort, G. Algebra and Analysis: Problems and Solutions. Amsterdam: North-Holland Publishing, 1964.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLefort, G. Algebra and Analysis: Problems and Solutions. North-Holland Publishing, 1964.
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