@article{10_1017_S0017089500007692,
     author = {Wnuk, Witold},
     title = {A note on the positive {Schur} property},
     journal = {Glasgow mathematical journal},
     pages = {169--172},
     year = {1989},
     volume = {31},
     number = {2},
     doi = {10.1017/S0017089500007692},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007692/}
}