@article{MS2_1963__12_165843,
     author = {A.L. Mullikin and K.T. Smith},
     title = {Elliptic {Differential} {Problems} with {High} {Order} {Boundary} {Conditions.}},
     journal = {Mathematica Scandinavica},
     pages = {178--188},
     publisher = {mathdoc},
     volume = {12},
     year = {1963},
     zbl = {0125.05503},
     url = {http://geodesic.mathdoc.fr/item/MS2_1963__12_165843/}
}