TY  - BOOK
AU  - Halmos, Paul R.
TI  - Problems for mathematicians, young and old 
T2  - Dolciani Mathematical Expositions, 
SN  - 9781470457198 (online)
PY  - 1991///
CY  - [Washington, D.C.]
PB  - Mathematical Association of America
KW  - Mathematics
UR  - https://doi.org/10.1090/dol/012
ER  -