@article {Li:2021gah,
	title = {Light speed variation in a string theory model for space-time foam},
	journal = {Phys. Lett. B},
	volume = {819},
	year = {2021},
	pages = {136443},
	doi = {10.1016/j.physletb.2021.136443},
	author = {Li, Chengyi and Ma, Bo-Qiang}
}
