@ARTICLE {, title = {K osemdesiatinám Doc. RNDr. Petra Baláža, CSc.}, author = {Hlaváč, Albert}, journal = {Obzory matematiky, fyziky a informatiky}, year = {1998}, volume = {27}, number = {51}, pages = {59--61}, issn = {1335-4981}, note = {Jubileum}, }