The demand on petroleum in Poland in the context of the changes in the sectorial and extrasectorial environment / Paweł Frączek, Zdzisław JEDYNAK, Maciej KALISKI // W: Challenges and barriers of the 21\textsuperscript{st} century economy = Sfide e barriere economiche nel XXI secolo : economic, legal, social and ecological aspects = aspetti economici, legali, sociali ed ecologici / eds. Ryszard Borowiecki, Andrzej Jaki ; Cracow University of Economics. Department of Economics and Organization of Enterprises, Foundation of the Cracow University of Economics. — Cracow : DEOE CUE, 2009. — ISBN: 978-83-927790-8-7. — S. 47–59. — Bibliogr. s. 58–59, Abstr.

The selected conditions for changing the structure of primary energy sources in EU countries / Paweł Frączek, Zdzisław JEDYNAK, Maciej KALISKI // W: Global and regional challenges for the 21\textsuperscript{st} century economies / eds. Ryszard Borowiecki, Andrzej Jaki ; Cracow University of Economics. Department of Economics and Organization of Enterprises, Foundation of the Cracow University of Economics. — Cracow : Cracow University of Economics. Department of Economics and Organization of Enterprises, cop. 2009. — ISBN: 978-83-927790-4-9. — S. 21–30. — Bibliogr. s. 29–30, Abstr.