@article {2016PhRvL.117i1101J, title = {Testing General Relativity with Accretion-Flow Imaging of Sgr A*}, journal = {Physical Review Letters}, volume = {117}, number = {9}, year = {2016}, pages = {091101}, doi = {10.1103/PhysRevLett.117.091101}, author = {Johannsen, T. and Wang, C. and Broderick, A.~E. and Doeleman, S.~S. and Fish, V.~L. and Loeb, A. and Psaltis, D.} }