@book{403918, title = {Uspo\v r\'adan\'e mno\v ziny}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1978}, language = {cs}, url = {http://dml.mathdoc.fr/item/403918} }
Beran, Ladislav. Uspořádané množiny. GDML_Books (1978), http://gdmltest.u-ga.fr/item/403918/