@article{10_4064_cm90_2_3,
     author = {Philippe Biane and Franz Lehner},
     title = {Computation of some examples of {Brown's
spectral} measure in free probability},
     journal = {Colloquium Mathematicum},
     pages = {181--211},
     publisher = {mathdoc},
     volume = {90},
     number = {2},
     year = {2001},
     doi = {10.4064/cm90-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm90-2-3/}
}