Nguyen, Tho Truong, Thi Minh Cao, Hieu Van Le, and Viet Van Pham. 2019. “Investigation of Some Characterizations of Black TiO\(_2\) Nanotubes Via Spectroscopic Methods”. Communications in Physics 29 (2):189. https://doi.org/10.15625/0868-3166/29/2/13762.