Some notes about boundaries on IF sets

MICHALÍKOVÁ, Alžbeta. Some notes about boundaries on IF sets. In New Trends in Fuzzy Sets, Intuitionistic Fuzzy Sets, Generalized Nets and Related Topics. Volume I.Foundations. 1. vyd. - Varšava : Systems Research Institute, 2013. ISBN 83-894-7546-4, pp. 105-113.