@article{10_4064_cm_51_1_141_147,
     author = {Colin C. Graham and Thomas Ramsey},
     title = {Three results on {I-sets}},
     journal = {Colloquium Mathematicum},
     pages = {141--147},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1987},
     doi = {10.4064/cm-51-1-141-147},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-51-1-141-147/}
}