@article{bwmeta1.element.bwnjournal-article-fmv114i1p12bwm,
author = {L. Kirby and K. McAllon and R. Murawski},
title = {Indicators, recursive saturation and expandability},
journal = {Fundamenta Mathematicae},
volume = {112},
year = {1981},
pages = {127-139},
zbl = {0488.03038},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv114i1p12bwm}
}
Kirby, L.; McAllon, K.; Murawski, R. Indicators, recursive saturation and expandability. Fundamenta Mathematicae, Tome 112 (1981) pp. 127-139. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv114i1p12bwm/