Algorithm 46. Determination of an interpolating quadratic spline function E. Neuman (1976) Applicationes Mathematicae
Algorithms 70-71. Determination of a quadratic spline function with given values of the integrals in subintervals E. Neuman (1980) Applicationes Mathematicae
An error analysis for absolute and relative approximation. R.V.M. Zahar, Bacopoulos.A. (1978) Aequationes mathematicae
Permanence de relations de récurrence dans certains développements asymptotiques. (Permanence of recurrence relations in certain asymptotic expansions). Robin, Guy (1988) Publications de l'Institut Mathématique. Nouvelle Série