On a relationship between the integrabilities of various maximal functions. Ephremidze, L. — 1995 Georgian Mathematical Journal
On the integrability of the ergodic Hilbert transform for a class of functions with equal absolute values. Ephremidze, L. — 1998 Georgian Mathematical Journal
The rearrangement inequality for the ergodic maximal function. Ephremidze, L. — 2001 Georgian Mathematical Journal