References

  1. Ch. J. de la Valle Poussin. Sur lequation differentielle du second ordre.Determination d'une integrale, par deux valours assignees. Extension aux eqation d'ordre. J. de Math. pur et appl. 1929, 8, 125-144.
  2. Bessmertnych G.A., Levin A.Yu. About some estimates of differentiable functions of one variable. Doklady Acad. Sci. USSR 1962, 144 (3), 171-174. (in Russian)
  3. Levin A.Yu. The estimation of function with a monotonically distributed zeros of subsequent derivatives. Math. Sbornik 1964, 64 (5), 396-409. (in Russian)
  4. Sobkovich R.I., Kazmerchuk A.I. Solvability of $n$-point problems with parameter for system of differential equations. Carpathian Math. Publ. 2010, 2 (2), 116-122. (in Ukrainian)