The Ljubljana Gap,[1][2] less often the Ljubljana Gate[3][4] (Slovene: Ljubljanska vrata), is a geographical term for
the transition area between the Alps and Dinaric Alps that passes from southwest to northeast between Trieste and Ljubljana.
^Weigley, Russell Frank (1991). The American Way of War: A History of United States Military Strategy and Policy. Bloomington, IN: Indiana University Press. p. 332.
^Morison, Samuel Eliot (2002). Invasion of France and Germany: 1944–1945. Urbana, IL: University of Illinois Press. p. 227.
^Scope of Soviet activity in the United States. Part 41: Hearings before the Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws of the Committee on the Judiciary. Washington, DC: United States Government Printing Office. 1956. p. 3385.
^Popov, Nebojša (2000). The Road to War in Serbia: Trauma and Catharsis. Budapest: Central European University Press. p. 633.