1. US patent 3,411,972, The moulding of chemically unreacted gelatin, Monsanto Research Corporation (1968).
2. F patent 1,293,184, Hercules Powder Company.
3. JP patent 53-19645.
4. US patent 4,076,846, Amylose composition containing low molecular weight plasticizer and hydrophilic high polymer, Sumimoto Bakelite Company (1976).
5. I. Tomka, State of research on photographic gelatins. Chimia 30:534 (1976).