2
   
4
   
10
Comprehending Queries [Elektronische Ressource]
Published: 1999
   
11
Published: Sankt Augustin, GMD-Forschungszentrum Informationstechnik, 1995
   
12
   
13
   
17
   
19
Published: Boston [u.a.], Kluwer Academic Publishers, 1995
   
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