@book{402910, title = {Kru\v znice}, series = {GDML\_Books}, publisher = {Jednota \v ceskoslovensk\'ych matematik\r u a fyzik\r u}, address = {Praha}, year = {1950}, language = {cs}, url = {http://dml.mathdoc.fr/item/402910} }
Setzer, Ota. Kružnice. GDML_Books (1950), http://gdmltest.u-ga.fr/item/402910/