1. , , . Method of manufacturing of hydrogel dressings. US Patent 4,871,490; 1989.
2. , , . Method of manufacturing of hydrogel dressings. Polish Patent 151,581; 1989.
3. , , . Method of manufacturing of hydrogel dressings. Hungarian Patent 204,866; 1989.
4. , , . Method of manufacturing of hydrogel dressings. UK Patent 2,200,643; 1989.
5. , , . Method of manufacturing of hydrogel dressings. Germany Patent 3,744,289. 1989.