1979: Relativistic Hamiltonian Dynamics, I. Classical Mechanics. Annals of Physics 117, 292-322.

1980: Relativistic Hamiltonian Dynamics, II. Momentum-Dependent Interactions, Confinement and Quantization. Annals of Physics 130, 350-394.

These two papers develop a canonical formulation for N-particle systems with constraints. Dynamical confinement is demonstrated both classically and quantum mechanically.

1981: Constraint relativistic quantum dynamics. Physical Review D 24, 1528-1542. With L. P. Horwitz.

A system of N relativistic spinless particles have a unitary S-matrix in N-dimensional ?-space. The separability of the interaction leads to a cluster decomposition.

There are a dozen other publications on relativistic dynamics.