@ARTICLE {, title = {Kvadratické rovnice a nerovnice}, author = {Doboš, Jozef}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2002}, volume = {31}, number = {4}, pages = {10--18}, issn = {1335-4981}, abstract = {Most of the quadratic equations and inequalities you will encounter in problem books can be solved by elementary methods.}, }