Asymptotic replication with modified volatility under small transaction   costs
  Dynamic hedging of an European option under a general local volatility model with small linear transaction costs is studied. A continuous control version of Leland's strategy that asymptotically replicates the payoff is constructed. An associated central limit theorem of hedging error is proved. The asymptotic error variance is minimized by an explicit trading strategy. 
Jiatu Cai and Masaaki Fukasawa
q-fin.MF math.OC math.PR