Use of the effective Lagrangian incorporating both the scalar and pseudoscalar mesons gives a possibility to calculate the $\pi \pi$-scattering lengths without attraction of the ChPT theory.
$ΔF = 2$ Effective Lagrangian in theories with vector like fermions
Effective Lagrangian for strong and electromagnetic interactions of high-spin resonances
Effective Lagrangian for SU(3)_c gluodynamics from lattice color dielectrics
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