@article{GDZPPN00221914X,
title = {Chapman's Classification of Shapes. A Proof Using Collapsing.},
journal = {Manuscripta mathematica},
volume = {17},
year = {1975},
pages = {373-384},
zbl = {0314.55012},
url = {http://dml.mathdoc.fr/item/GDZPPN00221914X}
}
Siebenmann, Larry. Chapman's Classification of Shapes. A Proof Using Collapsing.. Manuscripta mathematica, Tome 17 (1975) pp. 373-384. http://gdmltest.u-ga.fr/item/GDZPPN00221914X/