1. Ölextraktion nach dem „DIREX”︁‐Verfahren;Seifen‐Öle‐Fette‐Wachse,1972
2. Jaocs news feature: Results achieved by the “Direx” process
3. Extraction de l'huile des graines oléagineuses;van den Brock W. J.;Ind. Chim. Belge,1967
4. The solvent extraction of soybean flakes;King C. O.;Trans. A.I.Ch.E.,1944