%0 Journal Article %A Celso Martínez %A %A %T Distributional fractional powers of the Laplacean. Riesz potentials %J Studia Mathematica %D 1999 %P 253-271 %V 135 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-135-3-253-271/ %R 10.4064/sm-135-3-253-271 %G en %F 10_4064_sm_135_3_253_271