%0 Journal Article %A Attalienti, Antonio %A Rasa, Ioan %T Shape-preserving properties and asymptotic behaviour of the semigroup generated by the Black-Scholes operator %J Czechoslovak Mathematical Journal %D 2008 %P 457-467 %V 58 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2008__58_2_a10/ %G en %F CMJ_2008__58_2_a10