MP4 : Prof. Dr. Vasil Prodanov, Director of the Institute for Philosophical Research at BAS (Bulgarian Academy of Sciences)FLV : Prof. Dr. Vasil Prodanov, Director of the Institute for Philosophical Research at BAS (Bulgarian Academy of Sciences)MP4 FOR IPOD (edge) : Prof. Dr. Vasil Prodanov, Director of the Institute for Philosophical Research at BAS (Bulgarian Academy of Sciences)MP3 : Prof. Dr. Vasil Prodanov, Director of the Institute for Philosophical Research at BAS (Bulgarian Academy of Sciences)