@article{BarVai:62,
  journal = {C. R. Acad. Sci. Paris},
  volume = {255},
  title = {Le cas limite du crit\`ere de {W}ittmeyer pour la m\'ethode de
           {G}auss-{S}eidel},
  author = {Barb{\u{a}}lat, Ioan and Vaida, Drago{\c{s}}},
  year = {1962},
  pages = {235--237},
}