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APA Citation
Unknown (2006). Two-point boundary value problems : lower and upper solutions. Place of publication not identified : Elsevier Science. http://access.bl.uk/ark:/81055/vdc_100026148623.0x000001
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Unknown (2006). Two-point boundary value problems : lower and upper solutions. Place of publication not identified : Elsevier Science. http://access.bl.uk/ark:/81055/vdc_100026148623.0x000001