1. Freezing of coffee extract to produce a darker coloured freeze-dried product;Barnett,1973
2. A study of the freeze drying of some liquid foods in vacuo and at atmospheric pressure;Boeh-Ocansey;Drying Technol.,1983
3. Expériences nouvelles sur la lyophilisation;Dunoyer,1961
4. Glatt Maschinen- und Apparatebau AG, CH-4133 Pratteln/ Switzerland, U.S. Patent 4,608,764 (1986) and European Patent PCT/CH/88/00106 (1988).
5. An analysis of atmospheric freeze drying;Heldman;J. Food Sci.,1974