1. USSR Inventor’s Certificate 1742040.
2. Iznairov, B.M., Vasin, A.N., and Iznairov, O.B., Obespechenie ratsional’nykh geometricheskikh parametrov mnogozvennykh soedinenii i rezervirovanie ikh elementov (Ensuring rational geometric parameters of multicomponent joints and maintenance of component stocks), Saratov: SGTU, 2008.
3. Russian patent 24150004.