TY  - BOOK
AU  - Pohlers Wolfram
TI  - Proof theory: the first step into impredicativity
SN  - 978-3-540-69318-5
U1  - 511.3 
PY  - 2009///
CY  - Berlin
PB  - Springer-Verlag
KW  - Mathematical logic
KW  - Proof theory
ER  -