(1)
Gutik, O.; Popadiuk, O. On the Semigroup $\boldsymbol{B}_{\omega}^{\mathscr{F}_n}$, Which Is Generated by the Family $\mathscr{F}_n$ of Finite Bounded Intervals of $\omega$.
Carpathian Math. Publ.
2023
,
15
, 331-355.