PrefaceJajuga, Krzysztof; Locarek-Junge, Hermann; Orlowski, T. Lucjan; Staehr, KarstenContemporary Trends and Challenges in Finance : Proceedings from the 6th Wroclaw International Conference in Finance2021 / p. v-vi https://link.springer.com/book/10.1007/978-3-030-73667-5 Conference Proceeding at Scopus Article at Scopus