@article{106088, author = {Lev Bukovsk\'y and Eva Butkovi\v cov\'a}, title = {Ultrafilter with $\aleph\_0$ predecessors in Rudin-Frol\'\i k order}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {022}, year = {1981}, pages = {429-447}, zbl = {0495.54003}, mrnumber = {633575}, language = {en}, url = {http://dml.mathdoc.fr/item/106088} }
Bukovský, Lev; Butkovičová, Eva. Ultrafilter with $\aleph_0$ predecessors in Rudin-Frolík order. Commentationes Mathematicae Universitatis Carolinae, Tome 022 (1981) pp. 429-447. http://gdmltest.u-ga.fr/item/106088/
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