TY  - BOOK
AU  -  Helson,Henry
TI  -  Lectures on invariant subspaces
U1  -  513.82 HEL 
PY  - 1964///
CY  -  New York: 
PB  -  Academic Press , 
KW  -  Hilbert space
KW  -  Functions
N1  -  Includes bibliography : p. 129-130
ER  -