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Zhou, Z. (2014). a New Method for Research on the Center-Focus Problem of Differential Systems. Abstract and applied analysis, 2014, . http://access.bl.uk/ark:/81055/vdc_100085685691.0x00003f
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Zhou, Z. (2014). a New Method for Research on the Center-Focus Problem of Differential Systems. Abstract and applied analysis, 2014, . http://access.bl.uk/ark:/81055/vdc_100085685691.0x00003f