Strong estimate for square functions in higher dimensions. El Berdan, K. — 2000 Acta Mathematica Universitatis Comenianae. New Series
Pointwise weighted vector ergodic theorem in L 1 ( X ) . El Berdan, K. — 2002 Acta Mathematica Universitatis Comenianae. New Series
Vector ergodic theorem in L ( X ) log L ( X ) . El Berdan, K. — 2000 Acta Mathematica Universitatis Comenianae. New Series
The vector individual weighted ergodic theorem for bounded Besicovich sequences. El Berdan, K. — 1999 Acta Mathematica Universitatis Comenianae. New Series