@article{10_4153_CMB_1968_007_5,
     author = {King, J. P.},
     title = {A {Class} of {Positive} {Linear} {Operators}},
     journal = {Canadian mathematical bulletin},
     pages = {51--59},
     year = {1968},
     volume = {11},
     number = {1},
     doi = {10.4153/CMB-1968-007-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-007-5/}
}