1. Ripening changes in Cephalotyre ‘Ras’ cheese slurries
2. The manufacture of Ras cheese, 1966. Cited from: E. H. Youssef, Studies on Ras cheese. M. Sc. Thesis, Faculty of Agriculture, Air-Shams University, Cairo 1963.
3. Accelerated cheese ripening with heat treated cells of Lactobacillus helveticus and a commercial proteolytic enzyme