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<bib>
 <book>
   <author>Leslie Lamport</author>
   <title>Latex: A Document Preparation System </title>
   <year>1986</year>
   <publisher>Addison-Wesley</publisher>
 </book>

 <article>
   <author>David Marr</author>
   <title>Visual information processing</title>
   <year>1980</year>
   <volumn>290</volumn>
   <page>
     <from>199</from>
     <to>218</to>
   </page> 
   <journal>Phil. Trans. Roy. Soc. B</journal>
 </article>

 <article>
    <author>R. K. Clifton </author>
    <title>Breakdown of echo suppression in the precedence effect</title> 
    <year>1987</year>
    <volumn>82</volumn> 
    <page>
      <from>1834</from>
      <to>1835</to>
    </page> 
    <journal>J. Acoust. Soc. Am. </journal> 
  </article> 

  <book> 
    <author>David Marr</author> 
    <title>Vision</title>
    <year>1982</year> 
    <address> NY </address> 
    <publisher>Freeman</publisher>
  </book>

 <article>
   <author>David Marr</author>
   <title>Visual information processing</title>
   <year>1980</year>
   <volumn>290</volumn>
   <page>
     <from>199</from>
     <to>218</to>
   </page> 
   <journal> Phil. Trans. Roy. Soc. B</journal>
 </article>

</bib>


