@ARTICLE {, title = {Jedna problémová úloha pre vašich žiakov a jedna aj pre vás. One problem - Solving Task for Your Students and One also for You}, author = {Hrkota, Klement}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2010}, volume = {39}, number = {3}, pages = {39--40}, issn = {1335-4981}, abstract = {The problem of swimming magnetic needle and coil with corresponding magnetic poles on its opposite ends.}, }