@ARTICLE {, title = {Zadania {'u}loh 71. ro{`e}n{'i}ka Matematickej olympi{'a}dy}, author = {Krajčí, Stanislav}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2021}, volume = {50}, number = {2}, pages = {19--21}, issn = {1335-4981}, }