%0 Journal Article %A Gonzalo H. Ibañez Firnkorn %A María Silvina Riveros %T Certain fractional type operators with Hörmander conditions %J Annales Fennici Mathematici %D 2018 %P 913-929 %V 43 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.5186/aasfm.2018.4353/ %R 10.5186/aasfm.2018.4353 %G en %F AFM_2018_43_2_a17