@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/