2009
 
Benedikt Bollig, Peter Habermehl, Carsten Kern, and Martin Leucker. Angluin-Style Learning of NFA. In Proceedings of the Twenty-first International Joint Conference on Artificial Intelligence (IJCAI-09). pages 1004–1009. AAAI Press, 2009.

2008
 
Benedikt Bollig, Peter Habermehl, Carsten Kern, and Martin Leucker. Angluin-Style Learning of NFA. Technical Report LSV-08-28, Laboratoire Spécification et Vérification, ENS Cachan, France, 2008.