@article{AM2_1969__2_182327,
     author = {P. TUR\'AN},
     title = {On a {Certain} {Limitation} of {Eigenvalues} of {Matrices}},
     journal = {Aequationes mathematicae},
     pages = {184--189},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     zbl = {0174.06303},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182327/}
}