@article{MOMA_1974__78_186322,
     author = {Marvin Marcus and M. Shafqat Ali},
     title = {On the {Degree} of the {Minimal} {Polynomial} of the {Lyapunov} {Operator.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {229--236},
     publisher = {mathdoc},
     volume = {78},
     year = {1974},
     zbl = {0289.15009},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1974__78_186322/}
}