TY  - GEN
AU  - Halmos,P.R.
AU  - Halmos, P.R.
TI  - A hilbert space problem book
T2  - Graduate texts in mathematics
SN  - 0387906851
U1  - 515.733 
PY  - 1974///
CY  - [S.l.]
PB  - Springer
ER  -