Power-collapsing games. - Milos S. Kurilic; Boris Sobot (J. Symb. Log., 2008)

A game on Boolean algebras describing the collapse of the continuum. - Milos S. Kurilic; Boris Sobot (Ann. Pure Appl. Log., 2009)

Divisibility in the Stone-Cech compactification. - Boris Sobot (Reports Math. Log., 2015)

Divisibility in βN and *N. - Boris Sobot (Reports Math. Log., 2019)

|˜-divisibility of ultrafilters. - Boris Sobot (Ann. Pure Appl. Log., 2021)

Congruence of Ultrafilters. - Boris Sobot (J. Symb. Log., 2021)

More about divisibility in β N. - Boris Sobot (Math. Log. Q., 2021)

Multiplicative finite embeddability vs divisibility of ultrafilters. - Boris Sobot (Arch. Math. Log., 2022)