A Monte Carlo Event Generator for Z-pair production
and decay at LEP2/NLC energies with YFS exponentiation
S. Jadach, W. Placzek and B.F.L. Ward
See comments in the source code, e.g. in the file:
yfszz-1.02-export/100/yfszz.f
UTHEP-96-0702
S. Jadach, W. Placzek and B.F.L. Ward,
Gauge Invariant YFS Exponentiation of (Un)stable Z-Pair Production
At and Beyond LEP2 Energies,
UTHEP-96-0702, July 1996; Phys. Rev. D56 (1997) 6939
e-print archive:
hep-ph/9705430