Physical Review LettersComment on ‘‘Pseudospin symmetry and new collective modes of the Hubbard model’’I. A. Fomin, Peter Schmitteckert, P. WölflePublished Jul 6, 1992• 7 citationsPublisherAbstractA Comment on the Letter by Shoucheng Zhang Phys. Rev. Lett. 65, 120 (1990).Received 7 November 1991DOI:https://doi.org/10.1103/PhysRevLett.69.214©1992 American Physical SocietyDOI10.1103/physrevlett.69.214