@article{MZ_1985__189_173600,
     author = {Simon Fitzpatrick and Bruce Calvert},
     title = {In a {Nonreflexive} {Space} the {Subdifferential} is {Not} {Onto.}},
     journal = {Mathematische Zeitschrift},
     pages = {555--560},
     publisher = {mathdoc},
     volume = {189},
     year = {1985},
     zbl = {0551.46024},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173600/}
}