Tsareva A S

Publications in Math-Net.Ru

1. Sufficient condition of Hilbertness of some eigenfunctions systems of the second order differential operator
   
   Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.], 2(15) (2007),  158–161