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Difference-phase (or Hanbury Brown - Twiss type) intensity interference ofclassical light is considered in higher orders in the intensity. It is shownthat, while the visibility of sum-phase (NOON-type) interference for classicalsources drops with the order of interference, the visibility ofdifference-phase interference has opposite behavior. For three-photon andfour-photon interference of two coherent sources, the visibility can be as highas 81.8% and 94.4%, respectively. High-visibility three-photon and four-photoninterference of space-time and polarization types has been observed inexperiment, for both coherent and pseudo-thermal light.

High-visibility multi-photon interference of Hanbury Brown - Twiss type for classical light