%0 Journal Article %A Mateu, Joan %T A Counterexample in Lp Approximation by Harmonic Functions %J Canadian journal of mathematics %D 1997 %P 568-582 %V 49 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1997-026-3/ %R 10.4153/CJM-1997-026-3 %F 10_4153_CJM_1997_026_3