Physical Review LettersSecond-Harmonic Generation by a Resonant Spin SystemR. Boscaino, I. S. Ciccarello, G. CusumanoPublished Feb 26, 1968• 11 citationsPublisherAbstractReceived 6 November 1967DOI:https://doi.org/10.1103/PhysRevLett.20.421©1968 American Physical SocietyDOI10.1103/physrevlett.20.421