@article{Vai:57,
  journal = {Acad. R. P. Rom\^{a}ne. Stud. Cerc. Mat.},
  volume = {8},
  title = {D\'etermination des structures modulaires par des syst\`emes \`a
           axiomes ind\'ependants},
  author = {Vaida, Drago{\c{s}}},
  year = {1957},
  pages = {457--466},
}