@article{AUCMP_1990_31_2_a10,
     author = {Malykhin, V. I.},
     title = {The sequentiality and the {Fr\'echet-Urysohn} property with  respect to ultrafilters},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {65--69},
     year = {1990},
     volume = {31},
     number = {2},
     mrnumber = {1101417},
     zbl = {0792.54024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1990_31_2_a10/}
}