The paper is devoted to a topology of von Neumann type which is associated with a special invariant extension of the classical Lebesgue measure. The structure of the sets of density points for some sets having the Baire property with respect to this topology is investigated. In particular, a problem of Wilczynski concerning density points in the sense of category is solved.
"On density points with respect to von Neumann’s topology." Real Anal. Exchange 21 (1) 278 - 291, 1995/1996.