4 http://hdl.handle.net/10338.dmlcz/153232 4 Semiclean and quasi-clean elements in rings http://hdl.handle.net/10338.dmlcz/153251 Semiclean and quasi-clean elements in rings $n$-submodules of modules over commutative rings http://hdl.handle.net/10338.dmlcz/153250 $n$-submodules of modules over commutative rings A boundedness criterion for the discrete Hardy operator on weighted Musielak-Orlicz sequence spaces http://hdl.handle.net/10338.dmlcz/153249 A boundedness criterion for the discrete Hardy operator on weighted Musielak-Orlicz sequence spaces Lie $H$-pseudoalgebras with Rota-Baxter $H$-operators http://hdl.handle.net/10338.dmlcz/153248 Lie $H$-pseudoalgebras with Rota-Baxter $H$-operators