@article{AM2_1994__48_2-3_137614,
     author = {M. Marshall},
     title = {On {Br\"ocker's} t-invariant and separating families for constructible sets.},
     journal = {Aequationes mathematicae},
     pages = {306--316},
     year = {1994},
     volume = {48},
     number = {2-3},
     zbl = {0829.14026},
     url = {http://geodesic.mathdoc.fr/item/AM2_1994__48_2-3_137614/}
}