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Matjaz Mulej, Majda Bastic, Janko Belak, Jozica Knez-Riedl, Marjan Pivka, Vojko Potocan, Miroslav Rebernik, Dusko Ur, Zdenka Zenko, Nastja Mulej. Informal Systems Thinking Or Systems Theory. Cybernetics and Systems, 34(2):71-92, 2003.