1. F.N. Karelin and V.S. Tichonov, Method of recovery solutes in the form of solid products from the multicomponent solutions, USSR Patent No. 587-957.
2. F.N. Karelin and V.S. Tichonov, Method of salt concentration, USSR Patent No. 667-218.
3. A.P. Bogdanov, K.M. Saldadze, R.S. Gociridse, et al., The method of semipermeable polymer membrane manufacture, USSR Patent No. 1-248-629.
4. Desalination by reverse osmosis;Karelin;Strojisdt,1988