%0 Journal Article %A Gabriela Raluca Mocanu %T $C_0$-semigroups generated by second order differential operators %J Annales Polonici Mathematici %D 2016 %P 57-66 %V 116 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap3737-12-2015/ %R 10.4064/ap3737-12-2015 %G en %F 10_4064_ap3737_12_2015