@article{700994,
     title = {Some recent applications of ultrafilters to topology},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Springer},
     address = {Berlin},
     year = {1977},
     pages = {[34]-42},
     mrnumber = {MR0451187},
     zbl = {0366.54003},
     url = {http://dml.mathdoc.fr/item/700994}
}

Comfort, W. W. Some recent applications of ultrafilters to topology, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [34]-42. http://gdmltest.u-ga.fr/item/700994/