Advances and New Developments in Fuzzy Logic and Technology : Selected Papers from IWIFSGN'2019 - the Eighteenth International Workshop on Intuitionistic Fuzzy Sets and Generalized Nets Held on October 24-25, 2019 in Warsaw, Poland - Atanassov, Krassimir T.; Atanassova, Vassia; Kacprzyk, Janusz; Kałuszko, Andrzej; Krawczak, Maciej; Owsiński, Jan W.; Sotirov, Sotir S.; Sotirova, Evdokia; Szmidt, Eulalia; Zadrożny, Sławomir (Springer, 2021)