@article{00038594, title = {Two countable Hausdorff almost regular spaces every continuous map of which into every Urysohn space is constant.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {14}, year = {1991}, pages = {709-714}, doi = {10.1155/S0161171291000959}, zbl = {0757.54006}, language = {en}, url = {http://dml.mathdoc.fr/item/00038594} }
Tzannes, V. Two countable Hausdorff almost regular spaces every continuous map of which into every Urysohn space is constant.. International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991) pp. 709-714. doi : 10.1155/S0161171291000959. http://gdmltest.u-ga.fr/item/00038594/