1. Department of Physical Chemistry, Plovdiv University “Paisii Hilendarski,” 24 Tzar Asen Str., 4000 Plovdiv, Bulgaria
2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chausee Blvd., 1784 Sofia, Bulgaria
3. Department of Chemistry, Changwon National University, Changwon 51140, South Korea
4. Laboratory of Magnetism and Magnetic Materials, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
5. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
6. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
7. Department of Science Education, Chungbuk National University, Cheongju 360-763, South Korea