@article{GDZPPN002087138,
title = {Obstructions to Concordance for Thickenings.},
journal = {Inventiones mathematicae},
volume = {5},
year = {1968},
pages = {292-316},
zbl = {0157.54304},
url = {http://dml.mathdoc.fr/item/GDZPPN002087138}
}
HODGSON, J.P.E. Obstructions to Concordance for Thickenings.. Inventiones mathematicae, Tome 5 (1968) pp. 292-316. http://gdmltest.u-ga.fr/item/GDZPPN002087138/