@article{10_4064_fm_102_2_101_107,
     author = {C. Chong},
     title = {$\ensuremath{\Sigma}_n$-cofinalities of $J_\ensuremath{\alpha}$},
     journal = {Fundamenta Mathematicae},
     pages = {101--107},
     publisher = {mathdoc},
     volume = {102},
     number = {2},
     year = {1979},
     doi = {10.4064/fm-102-2-101-107},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-102-2-101-107/}
}