@article{MZ_1983__182_173297,
     author = {Allen L. Shields},
     title = {An {Analogue} of a {Hardy-Littlewood-Fej\'er} {Inequality} for {Upper} {Triangular} {Trace} {Class} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {473--484},
     publisher = {mathdoc},
     volume = {182},
     year = {1983},
     zbl = {0495.47027},
     url = {http://geodesic.mathdoc.fr/item/MZ_1983__182_173297/}
}