@article{10_4064_cm134_2_5,
     author = {Andrzej Ros{\l}anowski and Saharon Shelah},
     title = {Around ${\rm cofin}$},
     journal = {Colloquium Mathematicum},
     pages = {211--225},
     publisher = {mathdoc},
     volume = {134},
     number = {2},
     year = {2014},
     doi = {10.4064/cm134-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm134-2-5/}
}