9Nabandian RM,Mander IJ,Barrett JL,et al.Petechiae,ecchymoses,and necrosis of skin induced by coumarin congeners.Rare,occasionally lethal complication of anticoagulant therpy[J].JAMA,1965;192(7):107-112.
10Mc Carter JC,Binghanm JB,Meyer OO.Studies on the hemorrhagic agent 3,3-methylenebis IV(4-hydroxycoumarin)[J].The pathologic findings after the administration of dicumarol.Am J Patbol,1944;20:651-657.