Fuzzy Arithmetic Based On Boundary Weak T-Norms. - Michal K. Urbanski; Janusz Wasowski (Int. J. Uncertain. Fuzziness Knowl. Based Syst., 2005)

A note on Nguyen-Fullér-Keresztfalvi theorem and Zadeh's extension principle. - Adam Bzowski; Michal K. Urbanski (Fuzzy Sets Syst., 2013)

A note on the finite T-sum of L - R fuzzy numbers and further considerations. - Michal K. Urbanski; Kinga M. Wójcicka; Pawel M. Wójcicki (Fuzzy Sets Syst., 2021)

On fuzzy order in fuzzy sets based on t-norm fuzzy arithmetic. - Michal K. Urbanski; Dominika Krawczyk; Kinga M. Wójcicka; Pawel M. Wójcicki (Fuzzy Sets Syst., 2024)