Do, Phan, 		Tuyen, Vu, 		Khaidukov, N. M., AND 		Thanh, Nguyen.
" Predict optical properties of Dy3+ ions doped double potassium gadolinium fluoride crystal from absorption spectra" <em>VNU Journal of Science: Mathematics - Physics</em> [Online], Volume 28 Number 2 (15 June 2012)