Geopolitical location and territorial transformations of Ukrainian territory and the complexity of their internal structures in the twentieth century - Sobczyński, Marek; Barwiński, Marek (. Political and economical aspects of the Eastern politics of the European Union. - Łódź [u.a.], 2013. - 264 S.. - Ill.. - ISBN 978-83-7126-293-7, 2013)