1. Infrared focusators, new optical elements
2. Infra-red radiation focusators
3. Focusators for laser-branding
4. Multifocal diffractive elements
5. Goncharsky, A. V., Danilov, V. A., Popov, V. V., Prokhorov, A. M., Sisakian, I. N., Soifer, V. A. and Stepanov, V. V. 1985.Proceedings of the Ninth All-Union Symposium on Diffraction and Wave PropagationVol. 2, 420–423. Telavi, 1985 (in Russian).