Search for: [References = "Wiśniewski R., 2010, The intensity and the structure of the cross\-border traffic at the eastern boundary of Poland on the basis of a field study, \[w\:\] European Union external and internal borders interactions and networks, EUROPA XXI, 20, s. 31\-44. https\:\/\/doi.org\/10.7163\/Eu21.2010.20.2"]