@article{GDZPPN00206085X,
title = {Homological Methods and the Third Dimension Subgroup},
journal = {Commentarii mathematici Helvetici},
volume = {47},
year = {1972},
pages = {526-531},
zbl = {0254.20036},
url = {http://dml.mathdoc.fr/item/GDZPPN00206085X}
}
Bachmann, F.; Grünenfelder, L. Homological Methods and the Third Dimension Subgroup. Commentarii mathematici Helvetici, Tome 47 (1972) pp. 526-531. http://gdmltest.u-ga.fr/item/GDZPPN00206085X/