@article{MAN_1973__203_162429,
     author = {David E. Gibbs},
     title = {Cobordism with {Retractions.}},
     journal = {Mathematische Annalen},
     pages = {77--88},
     publisher = {mathdoc},
     volume = {203},
     year = {1973},
     zbl = {0239.57018},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__203_162429/}
}