@article{10_4064_fm_155_2_101_151,
     author = {Andrzej Ros{\l}anowski and Saharon Shelah},
     title = {Cardinal invariants of ultraproducts of {Boolean} algebras},
     journal = {Fundamenta Mathematicae},
     pages = {101--151},
     publisher = {mathdoc},
     volume = {155},
     number = {2},
     year = {1998},
     doi = {10.4064/fm-155-2-101-151},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-155-2-101-151/}
}