Privman Vladimir 
EXACT RESULTS FOR A THREE-BODY REACTION-DIFFUSION SYSTEM
(16K, TeX (plain))

ABSTRACT.  A system of particles hopping on a line, singly or
as merged pairs, and annihilating in groups of three on
encounters, is solved exactly for certain symmetrical initial
conditions. The functional form of the density is nearly identical to
that found in two-body annihilation, and both systems show
non-mean-field, ~1/t**(1/2) instead of ~1/t,
decrease of particle density for large times.