@article{GDZPPN002311259, title = {G\"odel's Square Axioms for the Continuum.}, journal = {Mathematische Annalen}, volume = {217}, year = {1975}, pages = {29-34}, zbl = {0289.02051}, url = {http://dml.mathdoc.fr/item/GDZPPN002311259} }
Ellentuck, Erik. Gödel's Square Axioms for the Continuum.. Mathematische Annalen, Tome 217 (1975) pp. 29-34. http://gdmltest.u-ga.fr/item/GDZPPN002311259/