1. A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan 0036, Armenia
2. Yerevan State University, Yerevan 0025, Armenia
3. National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, U.S.A.
4. Laboratory of Applied Physics, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
5. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam