Thang, Le Huu, Bui Quoc Thu, Vu Khanh Xuan, Ho Suhng Suh, and Pham Van Hoi. “Precision Frequency Measurement for He-Ne/ I<SUB>2</SUB> Laser Emission With KHz- Accuracy”. Communications in Physics 22, no. 2 (August 1, 2012): 161. Accessed April 25, 2024. https://vjs.ac.vn/index.php/cip/article/view/1615.