On extensions of σ -fields of sets Edward Grzegorek — 1993 Acta Universitatis Carolinae. Mathematica et Physica
Hereditary measurable sets and universal measure Edward Grzegorek — 1992 Acta Universitatis Carolinae. Mathematica et Physica
c -Luzin sets, nonatomic σ -fields and σ -independent sets Edward Grzegorek — 2007 Acta Universitatis Carolinae. Mathematica et Physica
On axial maps of direct product,s I Andrzej Ehrenfeucht; Edward Grzegorek — 1974 Colloquium Mathematicae