Troels Andreasen, Ronald R. Yager, Henrik Bulskov, Henning Christiansen, Henrik Legind Larsen <br/><br/>
Flexible Query Answering Systems 

 - Germany  Springer  2009 
<br/><br/><label>ISBN: </label>978-3-642-04957-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer Science<br/>Flexible Query Answering Systems