@article{10_4064_sm186_1_2,
     author = {Graham R. Allan},
     title = {An analytic approach to the spectral characterization
 of the radical},
     journal = {Studia Mathematica},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {186},
     number = {1},
     year = {2008},
     doi = {10.4064/sm186-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm186-1-2/}
}