参考文献

Pershin; Grigory Nikolaevich; Bogdanova; Nadezhda Sergeevna; Nikolaeva; Irina Sergeevna; Maichuk; Jury Fedorovich; Abramishvili; Roza Isaakovna; Avazov; Teshabai Nazarovich; Uretskaya; Galina Yakovlevna; Anikina; Svetlana Jurievna; Grinev; Alexei Nikolaevich; Kraft; Maxim Yakovlevich Patent: US4016289 A1, 1977 ;