Reference:
Ilkka Niemelä. Nonmonotonic logic in knowledge-based systems. Master's Thesis (in Finnish), Helsinki University of Technology, Department of Electrical Engineering, 1987.
Suggested BibTeX entry:
@misc{Niemela87, author = {Ilkka Niemel{\"a}}, howpublished = {{Master's Thesis} (in Finnish), Helsinki University of Technology, Department of Electrical Engineering}, title = {Nonmonotonic Logic in Knowledge-Based Systems}, year = {1987}, }