1. B.K. Green and L. Schleicher. Manifold record material U.S. Patent 2 730456, 1956.
2. B.K. Green and L. Schleicher Pressure responsive record materials U.S. Patent 2 730 457, 1956.
3. Manufacture of small capsules by coating with cellulose ethers or other polymers;Fanger;Neth. Appl.,1967
4. Controlled Release Technologies: Methods, Theory and Applications,1980
5. Microencapsulation par coacervalion;Chemlob;Labo-Pharma Probl. Tech.,1984