1. Microencapsulation;Bakan,1976
2. Natural Flavouring Substances, Their Sources, and Added Artificial Flavouring Substances;Council of Europe,1974
3. Encapsulated Microcapsules;D'Onofrio;M. Pharm. Thesis,1977
4. Micro-encapsulation by polyethyleneglycols;El-Egakey;Pharmazie,1974
5. Green, B.K. and Schleicher, L., U.S. Patent 2 730 456 Assigned to The National Cash Register Company, 1956.