%0 Journal Article %A Piotr Borodulin-Nadzieja %A David Chodounský %T Hausdorff gaps and towers in $\mathcal {P}(\omega )/ {\rm Fin}$ %J Fundamenta Mathematicae %D 2015 %P 197-229 %V 229 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm229-3-1/ %R 10.4064/fm229-3-1 %G en %F 10_4064_fm229_3_1