@article{10_1017_S0017089500005073,
     author = {Barnett, Christopher},
     title = {Averaging operators in non commutative {Lp} spaces {I}},
     journal = {Glasgow mathematical journal},
     pages = {71--74},
     year = {1983},
     volume = {24},
     number = {1},
     doi = {10.1017/S0017089500005073},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500005073/}
}