Syntactical Content of Finite Approximations of Partial Algebras. - Wiktor Bartol; Xavier Caicedo; Francesc Rosselló (Rough Sets and Current Trends in Computing, 1998)

Jerzy Los 1920-1998; Elements of Biography. - Stanislaw Balcerzyk; Wiktor Bartol; Ewa Orlowska; Andrzej Wieczorek; Agnieszka Wojciechowska-Waszkiewicz (Stud Logica, 2000)

On the coverings by tolerance classes. - Wiktor Bartol; Joe Miró; Konrad Pióro; Francesc Rosselló (Inf. Sci., 2004)

Mono-unary algebras are uniquely determined by their lattices of fuzzy weak subalgebras. - Wiktor Bartol; Jaume Casasnovas; Francesc Rosselló (Fuzzy Sets Syst., 2005)