@article{AM2_1978__17_136730,
     author = {Charles R. Johnson},
     title = {An inclusion region for the field of values of a doubly stochastic matrix based on its graph. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {114--115},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136730/}
}