@article{10_1017_S0017089500003943,
     author = {Humphreys, J. F.},
     title = {Rational valued and real valued projective characters of finite groups},
     journal = {Glasgow mathematical journal},
     pages = {23--28},
     year = {1980},
     volume = {21},
     number = {1},
     doi = {10.1017/S0017089500003943},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003943/}
}