Alexander S. Kechris. On Projective Ordinals. Journal of Symbolic Logic, 39(2):269-282, 1974.
@article{Kechris74,
title = {On Projective Ordinals},
author = {Alexander S. Kechris},
year = {1974},
researchr = {https://researchr.org/publication/Kechris74},
cites = {0},
citedby = {0},
journal = {Journal of Symbolic Logic},
volume = {39},
number = {2},
pages = {269-282},
}