KRAJČI, S., LENCSES, R., VOJTÁŠ, P. A Comparison of Fuzzy and Annotated Logic Programming. Fuzzy Sets and Systems. 2004, 144(-), 173-192. ISSN 0165-0114. E-ISSN 1872-6801. Dostupné z: https://doi.org/10.1016/j.fss.2003.10.019