PrefaceJajuga, Krzysztof; Orlowski, Lucjan T.; Staehr, KarstenContemporary Trends and Challenges in Finance : Proceedings from the 2nd Wroclaw International Conference in Finance2017 / p. v-vii https://link.springer.com/book/10.1007/978-3-319-54885-2 Conference proceedings at Scopus Article at Scopus