1. RF Patent 2153415, 1998, Byull. Izobret., 2000, no. 29.
2. RF Patent 2286998, 2005, Byull. Izobret., 2006, no. 35.
3. RF Patent 2128196, 1998, Byull. Izobret., 1999, no. 37.
4. USSR Inventor’s Certificate No. 1201294, Byull. Izobret., 1987, no. 48.
5. RF Patent 2142357, 1998, Byull. Izobret., 1999, no. 21.