"Théorie de l'approximation." . . "Splines, Théorie des." . . "Théorie des splines." . . . "The general problem and spline functions"@en . . . "The general problem of approximation and spline junctions"@en . . . . . . . . . . "The general problem of approximation and spline functions" . "The general problem of approximation and spline functions"@en . "The general problem of approximation and spline function" . . . . . . . . . . . . . "Approximation, Théorie de l'" . . "Spline-Funktion." . . "Fonctions continues." . . . . "Approximation." . .