@article{NUMA_1968__12_131877,
     author = {P. KEAST},
     title = {The {Third} {Boundary} {Value} {Problem} for {Elliptic} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {322--326},
     publisher = {mathdoc},
     volume = {12},
     year = {1968},
     zbl = {0167.45601},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__12_131877/}
}