Bremer, Kort, Alwis, Lourdes Shanika Malindi, Zheng, Yulong, Roth, Bernhard Wilhelm, "Towards Mode-Multiplexed Fiber Sensors: An Investigation on the Spectral Response of Etched Graded Index OM4 Multi-Mode Fiber with Bragg grating for Refractive Index and Temperature Measurement", Applied Sciences, 2020