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B. Pham Thanh, T. V. Nguyen, V. H. Pham, H. Bui, T. H. C. Hoang, T. C. Do and A. T. Nguyen, Highly-sensitive Refractometer Based on a D-shaped Fiber Bragg Grating Integrated into A Loop-mirror Optical Fiber Laser, Comm. Phys. 32 (2021) 11. DOI: https://doi.org/10.15625/0868-3166/16014.