Informal Systems Thinking Or Systems Theory. - Matjaz Mulej; Majda Bastic; Janko Belak; Jozica Knez-Riedl; Marjan Pivka; Vojko Potocan; Miroslav Rebernik; Dusko Ur; Zdenka Zenko; Nastja Mulej (Cybern. Syst., 2003)