@Article{ authors = " Jarosław M. Nazarczuk, Stanisław Umiński, Krystyna Gawlikowska-Hueckel", title = "The Role of Specialisation in the Export Success of Polish Counties in 2004-2015", journal = "Entrepreneurial Business and Economics Review", issue = "2018 / Tom 6 / Numer 2", pages = "91 - 109" }