We use this compilation throughout.
Please contact one of the authors in case that very high precision
is needed for a particular
matrix element. We would then convert the relevant quantity to the
newest data compilation available.
G. Ecker, J. Gasser, A. Pich and E. de Rafael, Nucl. Phys. B321 (1989) 311;
G. Ecker, J. Gasser, H. Leutwyler, A. Pich and E. de Rafael,
Phys. Lett. B223 (1989) 425;
J.F. Donoghue, C. Ramirez and G. Valencia, Phys. Rev. D39 (1989) 1947;
M. Praszalowicz and G. Valencia, Nucl. Phys. B341 (1990) 27.