ΔS = 0 effective weak chiral Lagrangianfrom the instanton vacuumHee-Jung Lee, Chang Ho Hyun, Chang-Hwan Lee and Hyun-Chul KimEur. Phys. J. C, 45 2 (2006) 451-457DOI: https://doi.org/10.1140/epjc/s2005-02442-3