V. MICIC, Z. LEPOJEVIC, M. JOTANOVIC, G. TADIC, und B. MANDIC, Influence pressure and size particle to extraction by CO2, The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, Bd. 31, Nr. 1, S. 117-123, Mai 2008.