3 http://hdl.handle.net/10338.dmlcz/116883 3 Seventieth anniversary of birthday of Academician Štefan Schwarz http://hdl.handle.net/10338.dmlcz/101974 Seventieth anniversary of birthday of Academician Štefan Schwarz Mon, 09 Jun 2008 15:01:47 GMT 85 years of Academician Otakar Borůvka http://hdl.handle.net/10338.dmlcz/101973 85 years of Academician Otakar Borůvka Mon, 09 Jun 2008 15:01:42 GMT Modular groupoids http://hdl.handle.net/10338.dmlcz/101972 Modular groupoids Mon, 09 Jun 2008 15:01:38 GMT A directed $d$-group that is not a group of divisibility http://hdl.handle.net/10338.dmlcz/101971 A directed $d$-group that is not a group of divisibility Mon, 09 Jun 2008 15:01:32 GMT