@article{CMFD_2010_38_a0,
     author = {P. L. Gurevich},
     title = {Elliptic problems with nonlocal boundary conditions and {Feller} semigroups},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {3--173},
     publisher = {mathdoc},
     volume = {38},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2010_38_a0/}
}