@article {1435199, title = {Testing General Relativity with the Black Hole Shadow Size and Asymmetry of Sagittarius A*: Limitations from Interstellar Scattering}, journal = {ApJ}, volume = {870}, number = {1}, year = {2019}, pages = {6}, url = {https://iopscience.iop.org/article/10.3847/1538-4357/aaef3d}, author = {Z. Zhu et al.} }