@article{1183529410, author = {Frol\'\i k, Zden\v ek}, title = {Fixed points of maps of $\beta N$}, journal = {Bull. Amer. Math. Soc.}, volume = {74}, number = {6}, year = {1968}, pages = { 187-191}, language = {en}, url = {http://dml.mathdoc.fr/item/1183529410} }
Frolík, Zdeněk. Fixed points of maps of $\beta N$. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp. 187-191. http://gdmltest.u-ga.fr/item/1183529410/