Abstract:
Variational principles are formulated that enable one to find the matrix elements of the three-
particle S matrix corresponding to the processes $(2\to3)$, $(3\to2)$, $(3\to3)$. These principles
are similar to Kohn's variational principle for a two-particle system.
Citation:
S. P. Merkur'ev, “Variational principle for three-particle systems”, TMF, 17:2 (1973), 221–229; Theoret. and Math. Phys., 17:2 (1973), 1105–1111