Aproblem in XQuery

Hi,

I have a problem in a query in a xml file, wich is the same as 

List books edited by "Abiteboul Serge" and "Buneman Peter"

Please help me

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<bib>

<book year="1994">

<title>TCP/IP Illustrated</title>

<author><last>Stevens</last><first>W.</first></author>

<publisher>Addison-Wesley</publisher>

<price> 65.95</price>

</book>



<book year="1992">

<title>Advanced Programming in the Unix environment</title>

<author><last>Stevens</last><first>W.</first></author>

<publisher>Addison-Wesley</publisher>

<price>65.95</price>

</book>



<book year="2000">

<title>Data on the Web</title>

<author><last>Abiteboul</last><first>Serge</first></author>

<author><last>Buneman</last><first>Peter</first></author>

<author><last>Suciu</last><first>Dan</first></author>

<publisher>Morgan Kaufmann Publishers</publisher>

<price>39.95</price>

</book>



<book year="1999">

<title>The Economics of Technology and Content for Digital TV</title>

<editor>

<last>Gerbarg</last><first>Darcy</first>

<affiliation>CITI</affiliation>

</editor>

<publisher>Kluwer Academic Publishers</publisher>

<price>129.95</price>

</book>



</bib>

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