@article{GDZPPN002353253,
title = {Index invariants of orbit spaces.},
journal = {Mathematica Scandinavica},
volume = {36},
year = {1975},
pages = {264-271},
zbl = {0306.58015},
url = {http://dml.mathdoc.fr/item/GDZPPN002353253}
}
Randell, Richard. Index invariants of orbit spaces.. Mathematica Scandinavica, Tome 36 (1975) pp. 264-271. http://gdmltest.u-ga.fr/item/GDZPPN002353253/