Harmonic majorization of | x 1 | in subsets of ℝ n , n ≥ 2 . Eiderman, Vladimir; Essén, Matts — 1996 Annales Academiae Scientiarum Fennicae. Series A I. Mathematica
On Exceptional Sets for Superharmonic Functions in a Halfspace: An Inverse Problem. Matts Essén; Vladimir Eiderman — 1995 Mathematica Scandinavica