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DURELL (C V), . (1927). Concise geometrical conics. London: Macmillan & Co. Ltd.
DURELL (C V), . 1927. Concise geometrical conics. London: Macmillan & Co. Ltd.
DURELL (C V), . Concise geometrical conics. London: Macmillan & Co. Ltd. 1927.