Reducing hyperarithmetic sequences

@article{Carstens1975,
author = {Carstens, Hans},
journal = {Fundamenta Mathematicae},
language = {eng},
number = {1},
pages = {5-11},
title = {Reducing hyperarithmetic sequences},
url = {http://eudml.org/doc/214853},
volume = {89},
year = {1975},
}

TY - JOUR
AU - Carstens, Hans
TI - Reducing hyperarithmetic sequences
JO - Fundamenta Mathematicae
PY - 1975
VL - 89
IS - 1
SP - 5
EP - 11
LA - eng
UR - http://eudml.org/doc/214853
ER -