%0 Journal Article %T Remark on Spectral Rigidity for Magnetic Schr£żdinger Operators %A Gregory Eskin %A James Ralston %J Mathematics %D 2011 %I arXiv %X We give a simple proof of Guillemin's theorem on the determination of the magnetic field on the torus by the spectrum of the corresponding Schr\"odinger operator. %U http://arxiv.org/abs/1105.2064v1