BorzooeiR. A., RezaeiG. R., and JunY. B. “Fuzzy Weak Filters of Sheffer Stroke Hilbert Algebras”. Annales Mathematicae Silesianae, Vol. 37, no. 2, July 2023, pp. 185-03, https://journals.us.edu.pl/index.php/AMSIL/article/view/15790.