@article{KJM_2007_30_1_a20,
     author = {Ivanka Tr. Angelova and Lubin G. Vulkov},
     title = {Marchuk identity-type second order difference schemes of 2-d and 3-d elliptic problems with intersected interfaces},
     journal = {Kragujevac Journal of Mathematics},
     pages = {277 - 292},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {2007},
     zbl = {1199.65358},
     url = {http://geodesic.mathdoc.fr/item/KJM_2007_30_1_a20/}
}