Shterengas S S

Publications in Math-Net.Ru

1. Riesz summation and the operator cosine-function
   
   Dokl. Akad. Nauk SSSR, 276:1 (1984),  51–54
2. Riesz-summation of fourier series with respect to the eigenfunctions of an abstract operator
   
   Mat. Zametki, 26:6 (1979),  865–873