哪位朋友能帮我下一下这几篇文献，十分感谢！

1、

【篇名】The impactof the lengths of estimation periods and hedging horizons on the effectivenessof a Hedge: Evidence from foreign currency futures

【作者】A. G.Malliaris;Jorge L. Urrutia

【链接】http://onlinelibrary.wiley.com/doi/10.1002/fut.3990110303/abstract

2、

【篇名】Cointegrationand error correction models: Intertemporal causality between index and futuresprices 【作者】Asim Ghosh【链接】http://onlinelibrary.wiley.com/doi/10.1002/fut.3990130206/abstract

3、

【篇名】Multiperiod hedging in the presence of conditionalheteroskedasticity

【作者】Donald Lien;Xiangdong Luo

【链接】http://onlinelibrary.wiley.com/doi/10.1002/fut.3990140806/abstract