@article{10_4064_sm194_1_3,
     author = {Marc P. Thomas},
     title = {The canonical test case for the 
    non-commutative {Singer{\textendash}Wermer} conjecture},
     journal = {Studia Mathematica},
     pages = {43--63},
     year = {2009},
     volume = {194},
     number = {1},
     doi = {10.4064/sm194-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm194-1-3/}
}