@article{10_1007_s10492_008_0011_3,
     author = {Jia, Shanghui and Li, Deli and Liu, Tang and Zhang, Shuhua},
     title = {Richardson extrapolation and defect correction of mixed finite element methods for integro-differential equations in porous media},
     journal = {Applications of Mathematics},
     pages = {13--39},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {2008},
     doi = {10.1007/s10492-008-0011-3},
     mrnumber = {2382288},
     zbl = {1177.76408},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-008-0011-3/}
}