TY  - JOUR
AU  - W. Reinhardt
TI  - Set existence principles of Shoenfield, Ackermann, and Powell
JO  - Fundamenta Mathematicae
PY  - 1974
SP  - 5
EP  - 34
VL  - 84
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-84-1-5-34/
DO  - 10.4064/fm-84-1-5-34
LA  - en
ID  - 10_4064_fm_84_1_5_34
ER  -