@article{AM2_1968__1_135982,
     author = {Paul Tur\'an},
     title = {On a {Certain} {Limitation} fo {Eigenvalues} of {Matrices.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {307--308},
     publisher = {mathdoc},
     volume = {1},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/AM2_1968__1_135982/}
}