<?xml version='1.0'?>
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   <book year="2000">
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   <book year="1999">
    <title>The Economics of Technology and Content for Digital TV</title>
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     <last>Gerbarg</last><first>Darcy</first>
     <affiliation>CITI</affiliation>
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    <price>129.95</price>
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   <book year="2004">
    <title>Beginning XML, 3rd Edition</title>
    <author><last>Hunter</last><first>David</first></author>
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    <author><last>Rafter</last><first>Jeff</first></author>
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