1. Nicoletti, O., Sulle condizioni iniziali che
determiniano gli integrali della diffenziali ordinazie, Torino: Atti della R. Acc.
Sc., 1897.
2. Tamarkin, Ya.D., O nekotorykh obshchikh zadachakh teorii
obyknovennykh differentsial’nykh uravnenii i o razlozhenii proizvol’nykh funktsii v
ryady (On Some General Problems of the Theory of Ordinary Differential Equations
and Series Expansions of Arbitrary Functions), Petrograd: Tipograf.
M.P. Frolovoi, 1917.
3. De la Vallee-Poussin, Ch.J., Sur l’équation différentielle
linéare du second ordre. Détermination d’une integrale par deux valeurs
assignées. Extension aux équations d’orde $$n
$$, J. Math. Pures
Appl., 1929, vol. 8, no. 9.
4. Kiguradze, I.T., Boundary-value problems for systems of ordinary differential
equations, J. Sov. Math., 1987, vol. 30,
pp. 3–103.
5. Nakhushev, A.M., On nonlocal boundary value problems with shift and their
relations with loaded equations, Differ. Uravn., 1995,
vol. 21, no. 1, pp. 92–101.