@article{AM2_1987__34_137242,
     author = {E. Luft},
     title = {On contractible open 3-manifolds.},
     journal = {Aequationes mathematicae},
     pages = {231--239},
     publisher = {mathdoc},
     volume = {34},
     year = {1987},
     zbl = {0639.57007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__34_137242/}
}