@misc{Mentzen_Mieczysław_Kazimierz_Group,
 author={Mentzen, Mieczysław Kazimierz},
 address={Toruń},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Mikołaja Kopernika},
 language={eng},
 title={Group extension of dynamical systems in ergodic theory and topological dynamics},
 type={książka},
}