@article{10_1017_S0017089500002901,
     author = {McDonald, John N.},
     title = {Extreme operators on {H\ensuremath{\infty}}},
     journal = {Glasgow mathematical journal},
     pages = {155--157},
     year = {1976},
     volume = {17},
     number = {2},
     doi = {10.1017/S0017089500002901},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002901/}
}