SYMMETRIES AND FIRST INTEGRALS OF A SECOND ORDER EVOLUTIONARY OPERATOR EQUATION Статья Budochkina S.A., Vasilyev Vladimir B. Eurasian Mathematical Journal. Eurasian Mathematical Journal. Том 3. 2012. С. 18-28
OPTIMAL RECONSTRUCTION OF A HARMONIC FUNCTION FROM INACCURATE INFORMATION ON THE VALUES OF THE RADIAL INTEGRATION OPERATOR Статья Bagramyan T.È. Vladikavkazskiĭ Matematicheskiĭ Zhurnal. Том 14. 2012. С. 22-36