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Tonchev, T., Djarova, J. & Nenov, I. (1989). Technology Development and Product Life Cycle: The Case of Counter-pressure Casting in Bulgaria. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-89-044

Djarova, J., Nachev, G., Nenov, I. & Tonchev, T. (1987). Management and Technology Life Cycle: Bulgarian Case Study on the Technology of Counter-pressure Casting. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-87-088