@article{10_4153_CMB_1992_061_7,
     author = {Borwein, J. M. and Th\'era, M.},
     title = {Sandwich {Theorems} for {Semicontinuous} {Operators}},
     journal = {Canadian mathematical bulletin},
     pages = {463--474},
     year = {1992},
     volume = {35},
     number = {4},
     doi = {10.4153/CMB-1992-061-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-061-7/}
}