@Article{zbMATH03078909,
Author = {T. S. {Motzkin} and W. {Wasow}},
Title = {{On the approximation of linear elliptic differential equations by difference equations with positive coefficients}},
FJournal = {{Journal of Mathematics and Physics}},
Journal = {{J. Math. Phys., Mass. Inst. Techn.}},
ISSN = {0097-1421},
Volume = {31},
Pages = {253--259},
Year = {1953},
Publisher = {Massachusetts Institute of Technology, Cambridge, MA},
Language = {English},
Zbl = {0050.12501}
}