1. Nicoletti, O.: Sulle Condizioni Iniziali Che Determiniano Gli Integrali Della Diffenziali Ordinazie. Att della R. Acc. Sc, Torino (1897)
2. De la Vallée-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. 8(9),(1929)
3. Nakhushev, A.M.: Loaded Equations and Applications. Nauka, Moscow (2012)
4. Aida-zade, K.R., Abdullaev, V.M.: On the solution of boundary value problems with nonseparated multipoint and integral conditions. Diff. Equ. 49(9), 1114–1125 (2013)
5. Abdullaev, V.M., Aida-zade, K.R.: Numerical method of solution to loaded nonlocal boundary value problems for ordinary differential equations. Comput. Math. Math. Phys. 54(7), 1096–1109 (2014)