Physical Review LettersComment on “Quantum-Mechanical Position Operator in Extended Systems”J. ŽákPublished Jul 31, 2000• 19 citationsPublisherAbstractA Comment on the Letter by Raffaele Resta, Phys. Rev. Lett. 80, 1800 (1998).Received 29 October 1999DOI:https://doi.org/10.1103/PhysRevLett.85.1138©2000 American Physical SocietyDOI10.1103/physrevlett.85.1138