He had already begun reading French structuralists prior to entering university, and in 1967 he published the first translation of a text by Jacques Derrida into Slovenian. Žižek frequented the circles of dissident intellectuals, including the Heideggerian philosophers Tine Hribar and Ivo Urbančič, and published articles in alternative magazines, such as "Praxis", "Tribuna" and "Problemi", which he also edited. In 1971 he accepted a job as an assistant researcher with the promise of tenure, but was dismissed after his Master's thesis was denounced by the authorities as being "non-Marxist". He graduated from the University of Ljubljana in 1981 with a Doctor of Arts in Philosophy for his dissertation entitled "The Theoretical and Practical Relevance of French Structuralism".