511 <br/> R-79 
<br/> Rosen H. <br/>
          Discrete Mathematics and its applications 
  
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.- London.: Rinehart and Winston, 2005
.- 675, 
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<br/><br/><label>Source: </label> Худалдаж авсан 
<br/><br/><label>Тавиурын заалт: </label>511  / R-79