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