 Aizenstein, H. 

 Aizenstein, H.  Exact learning of readtwice DNF formulas  1991 
 Aizenstein, H.  Exact learning of readk disjoint DNF and notsodisjoint DNF  1992 
 Aizenstein, H.  Readthrice DNF is hard to learn with membership and equivalence queries  1992 
 Aizenstein, H.  On the Learnability of Disjunctive Normal Form Formulas and Decision Trees.  1993 
