Yano-Koonin-Podgoretski ĭ parametrisation of the Hanbury Brown-Twiss correlator Y.-F. Wu U. Heinz, B. Tomášik and U.A. Wiedemann Eur. Phys. J. C, 1 3/4 (1998) 599-617 Published online: 15 February 1998 DOI: 10.1007/s100520050109