@article{MS2_1966__19_165958,
     author = {Vidar Thom\'ee},
     title = {Parabolic {Difference} {Operators.}},
     journal = {Mathematica Scandinavica},
     pages = {77--107},
     publisher = {mathdoc},
     volume = {19},
     year = {1966},
     zbl = {0171.13804},
     url = {http://geodesic.mathdoc.fr/item/MS2_1966__19_165958/}
}