@Article{ authors = " Stefan Marek Grochalski, Paweł Jakub Szewczyk", title = "The European Union and the Eurasian Union in the context of citizenship : Similarities and differences ", journal = "Studia z zakresu nauk prawnoustrojowych. Miscellanea", issue = "2018 / Tom 8 / Numer 2", pages = "45 - 59" }