On IF-numbers

KLUVANCOVÁ, Daniela - RIEČAN, Beloslav. On IF-numbers. In International conference on intuitionistic fuzzy sets. medzinárodná vedecká konferencia. Notes on intuitionistic fuzzy sets : 20th ICIFS, 2-3 September 2016, Sofia. - Sofia : Bulgarian academy of sciences, 2016. ISSN 1310-4926, 2016, vol. 22, no. 3, s. 9-14.