@misc{Tarchała_Katarzyna_Multi,
 author={Tarchała, Katarzyna and Walczak, Paweł},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Śląskiego},
 publisher={De Gruyter Open},
 language={eng},
 title={Multi Ping-Pong and an Entropy Estimate in Groups},
 type={czasopismo},
 keywords={topological entropy, transformation group, ping-pong},
}