@article{10_4064_fm229_3_1,
     author = {Piotr Borodulin-Nadzieja and David Chodounsk\'y},
     title = {Hausdorff gaps and towers in $\mathcal {P}(\omega )/ {\rm Fin}$},
     journal = {Fundamenta Mathematicae},
     pages = {197--229},
     publisher = {mathdoc},
     volume = {229},
     number = {3},
     year = {2015},
     doi = {10.4064/fm229-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm229-3-1/}
}