@Article{ authors = " Krystian Heffner, Agnieszka Rochmińska", title = "The lasting and historical interregional borderlands in Poland ", journal = "European Spatial Research and Policy", issue = "2003 / Tom 10 / Numer 1", pages = "73 - 84" }

@Article{ authors = " Krystian Heffner, Arie Dekker", title = ""Conflict in urban development : a comparison between East and West Europe", Arie Dekker [et al.], Aldershot 1992 : [recenzja]", journal = "European Spatial Research and Policy", issue = "1994 / Tom 1 / Numer 2", pages = "118 - 120" }