@article{10_1007_s10492_009_0012_x,
     author = {Lin, Qun and Liu, Tang and Zhang, Shuhua},
     title = {Superconvergence estimates of finite element methods for {American} options},
     journal = {Applications of Mathematics},
     pages = {181--202},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {2009},
     doi = {10.1007/s10492-009-0012-x},
     mrnumber = {2530538},
     zbl = {1212.65252},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-009-0012-x/}
}