Physical Review LettersMultiple-Photon Processes and Higher Order Correlation FunctionsMalvin Carl Teich, G. J. WolgaPublished Apr 4, 1966• 61 citationsPublisherAbstractReceived 18 February 1966DOI:https://doi.org/10.1103/PhysRevLett.16.625©1966 American Physical SocietyDOI10.1103/physrevlett.16.625