@article{DCG_1989__4_6_131059,
     author = {N. L. White},
     title = {A {Nonuniform}  {Matroid} {Which} {Violates} the  {Isotopy} {Conjecture.}},
     journal = {Discrete & computational geometry},
     pages = {1--2},
     year = {1989},
     volume = {4},
     number = {6},
     zbl = {0657.05019},
     url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131059/}
}