@article{10_1017_S0017089500007448,
     author = {Robertson, A. Guyan},
     title = {An extreme positive operator on a polyhedral cone},
     journal = {Glasgow mathematical journal},
     pages = {347--348},
     year = {1988},
     volume = {30},
     number = {3},
     doi = {10.1017/S0017089500007448},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007448/}
}