Cyclic vectors and invariant subspaces for the backward shift operator

Douglas, R. G.; Shapiro, H. S.; Shields, A. L.

Annales de l'Institut Fourier, Volume 20 (1970) p. 37-76

The space of bounded analytic functions on a region

Rubel, Lee A.; Shields, A. L.

Annales de l'Institut Fourier, Volume 16 (1966) p. 235-277