@article{MAN_1985__272_164006,
     author = {T.W. Gamelin},
     title = {On an {Estimate} of {Axler} and {Shapiro.}},
     journal = {Mathematische Annalen},
     pages = {189--196},
     publisher = {mathdoc},
     volume = {272},
     year = {1985},
     zbl = {0569.32006},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__272_164006/}
}