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MLA Citation
Ruyun Ma et al.. “Existence of Positive Solutions of Nonlinear Second-Order Periodic Boundary Value Problems.” Boundary value problems, vol. 2010, 2010, p. . http://access.bl.uk/ark:/81055/vdc_100082239602.0x00003e
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Ruyun Ma et al.. “Existence of Positive Solutions of Nonlinear Second-Order Periodic Boundary Value Problems.” Boundary value problems, vol. 2010, 2010, p. . http://access.bl.uk/ark:/81055/vdc_100082239602.0x00003e