@article{10_4064_fm_101_1_1_10,
     author = {C. Belna and M. Evans and P. Humke},
     title = {Most directional cluster sets have common values},
     journal = {Fundamenta Mathematicae},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {101},
     number = {1},
     year = {1978},
     doi = {10.4064/fm-101-1-1-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-101-1-1-10/}
}