Neutral theory models ofS-wave π-π scattering fulfilling rigorous conditions

Absolute upper bounds for ππ scattering

1967 • 164 citations

Geometrical restrictions on the pion-pion partial waves

1967 • 147 citations

New evidence for the sigma meson

1966 • 94 citations

Bounds on the energy dependence of phase shifts from analyticity and unitarity

1967 • 9 citations