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<http://webisa.webdatacommons.org/253011016>	<http://www.w3.org/ns/prov#value>	"Stephen Kobrin, a Wharton management professor and executive director of Wharton Digital Press, points out that Apple's textbooks  will not work on devices such as the Barnes & Noble Nook and Amazon's Kindle line of tablets and e-readers." .
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