Protective properties of butanolic extract of the Calendula officinalis L. (marigold) against lipid peroxidation of rat liver microsomes and action as free radical scavenger - Cordova,C.A.; Siqueira,I.R.; Netto,C.A.; Yunes,R.A.; Volpato,A.M.; Cechinel Filho,V. (Redox Rep, 2002)