[1] Zeitz F. Modern Theory of Solid State. -M.-L.: Gostekhizdat, 1949. - 720 p.

[2]  G.M. About finiteness of the discrete spectrum of energy operators of quantum systems of many-particle systems // Dokl. of the USSR Academy of Sciences. - 1972. - 207, No 1. - P.25-28.

[3] Smirnov M.M. Growing elliptic and hyperbolic equations. - M.: Nauka, 1966. - 292 p.

[4] Bitsadze A.V. Some classes of equations in partial derivatives. - M.: Nauka, 1981. - 448 p.

[5] Ladyzhenskaya O.A., Solonnikov V.A., Uraltseva N.N. Linear and quasilinear equations of parabolic type. - M.: Nauka, 1967. - 736 p.

[6] Matiychuk M.I. Parabolic and elliptic boundary value problems with features - Chernivtsi: Prut, 2003. - 248 p.

[7] Pukal'skii I.D. Boundary value problems for nonuniformly parabolic and elliptic equations with degeneracies and singularities - Chernivtsi: Ruta, 2008. - 253 p.

[8]  Samoilenko A.M., Perestyuk N.A. Impulsive Differential Equations. – Singapore: World Scientific, 1995. – 462 p.

[9]  Perestyuk N.A., Plotnikov N.A., Samoilenko A.M., Skripnik N.V. Differential Equations with Impulse Effects: Multivalued Right-hand Sides with Discontinuities. – Walter de Gruyter Co, Berlin, 2011.

[10]  Asanova A.T. About nonlocal boundary value problem for systems of hyperbolic equations with impulse influences // Ukr. mat. zhurn. 2013. -65, No 3. - С. 315-328.

[11]  Perestyuk N.A., Trach A.B. Periodic solutions for weakly nonlinear partial system with pulse influence // Ukr. Math. J. – 1997. – 49, N 4. – P. 601–605.

[12]  Boinov D.D., Minchev E., Myshkis A. Periodic Boundary value problems for impulsive hyperbolic systems // Commun. Appl. Anal. – 1997. – 1, N 4. – P. 1–14.

[13] Matiychuk M.I. Parabolic and elliptic problems in Dini spaces: monograph. - Chernivtsi, 2010. - 248 p.

[14] Friedman A. Equations with partial derivatives of parabolic type. - M.: Mir, 1968. -427 p.