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Popa, M. N. The center and focus problem : algebraic solutions and hypotheses Abingdon, Oxon : CRC Press, 2022. ix, 215 p. -- (Monographs and research notes in mathematics) QA247.4 P66 |
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Popa, M. N. The center and focus problem : algebraic solutions and hypotheses Abingdon, Oxon : CRC Press, 2022. ix, 215 p. -- (Monographs and research notes in mathematics) QA247.4 P66 |