TY  - JOUR
AU  - Hans Carstens
TI  - Reducing hyperarithmetic sequences
JO  - Fundamenta Mathematicae
PY  - 1975
SP  - 5
EP  - 11
VL  - 89
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-89-1-5-11/
DO  - 10.4064/fm-89-1-5-11
LA  - en
ID  - 10_4064_fm_89_1_5_11
ER  -