%0 Journal Article %A Mastroianni, G. %T Polynomial inequalities, functional spaces and best approximation on the real semiaxis with Laguerre weights %J Electronic transactions on numerical analysis %D 2002 %P 142-151 %V 14 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2002__14__a5/ %G en %F ETNA_2002__14__a5