Dichotomy of the pion Mass Formula for 0 — Mesons  Pseudovector projection of the Bethe-Salpeter wave function onto the origin in configuration space –Namely, the pseudoscalar meson's leptonic decay constant, which is the strong interaction contribution to the strength of the meson's weak interaction USC School on Non-Perturbative Physics: 26/7-10/8 Craig Roberts: Emergence of DSEs in Real-World QCD 2A (84) 14 Maris, Roberts and Tandy nucl-th/9707003nucl-th/9707003, Phys.Lett.
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