1. On absolutely convergent exponential sums;Brown;Trans. Amer. Math. Soc.,1960
2. Possible structures for the set of cyclic vectors;Herrero;Indiana Univ. Math. J.,1979
3. Series and sequences of exponential polynomials;Leontev;Proc. Steklov Inst. Math.,1987
4. On approximation in domains by various systems of analytic functions;Leontev,1970
5. Strongly cyclic elements of the diagonal operator and completeness of one system of analytic functions;Nagnibida;Dokl. Akad. Nauk Ukraine SSR Ser. A,1983