@article{10_4064_ap76_1_8,
     author = {Arno van den Essen and Peter van Rossum},
     title = {A class of counterexamples to {the
Cancellation} {Problem} for arbitrary rings},
     journal = {Annales Polonici Mathematici},
     pages = {89--93},
     publisher = {mathdoc},
     volume = {76},
     number = {1-2},
     year = {2001},
     doi = {10.4064/ap76-1-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap76-1-8/}
}