@article{10_4171_ifb_163,
     author = {Johannes Elschner and Joachim Rehberg and Gunther Schmidt},
     title = {Optimal regularity for elliptic transmission problems including $C^1$ interfaces},
     journal = {Interfaces and free boundaries},
     pages = {233--252},
     year = {2007},
     volume = {9},
     number = {2},
     doi = {10.4171/ifb/163},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/163/}
}