Affiliations: Sofia University “St. Kliment Ohridski” Faculty of Mathematics and Informatics 5, James Bourchier Blvd., 1164 Sofia, Bulgaria [email protected] http://www.fmi.uni-sofia.bg/fmi/logic/nikolova/
DOI: 10.3233/COM-14026
Journal: Computability, vol. 3, no. 1, pp. 63-72, 2014