@article{CMUC_2005__46_4_a10,
     author = {Hern\'andez-Hern\'andez, Fernando},
     title = {A tree $\pi $-base for $\Bbb R^\ast$ without cofinal branches},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {721--734},
     publisher = {mathdoc},
     volume = {46},
     number = {4},
     year = {2005},
     mrnumber = {2259502},
     zbl = {1121.54057},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2005__46_4_a10/}
}