@article{105005, author = {Petr Vop\v enka and Ale\v s Pultr and Zden\v ek Hedrl\'\i n}, title = {A rigid relation exists on any set}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {006}, year = {1965}, pages = {149-155}, zbl = {0149.01402}, mrnumber = {0183647}, language = {en}, url = {http://dml.mathdoc.fr/item/105005} }
Vopěnka, Petr; Pultr, Aleš; Hedrlín, Zdeněk. A rigid relation exists on any set. Commentationes Mathematicae Universitatis Carolinae, Tome 006 (1965) pp. 149-155. http://gdmltest.u-ga.fr/item/105005/
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