@article{10_1017_S0017089500000781,
     author = {Leavitt, W. G.},
     title = {Hereditary semisimple classes},
     journal = {Glasgow mathematical journal},
     pages = {7--8},
     year = {1970},
     volume = {11},
     number = {1},
     doi = {10.1017/S0017089500000781},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500000781/}
}