@article{JRAM_1957__198_150348,
     author = {A.E. Taylor and Ch.J.A. Jr. Halberg},
     title = {General theorems about a bounded linear operator and its conjugate.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {93--111},
     publisher = {mathdoc},
     volume = {198},
     year = {1957},
     zbl = {0078.10301},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1957__198_150348/}
}