1. L. Bergström andS. Dawson:Phys. Lett. B,232, 387, (1989).
2. S. Dawson, H. E. Haber andS. D. Rindani:Higgs Boson hunting, SCIPP-89/15, BNL-42853 (1989).
3. A. Pich: η-Decays and chiral Lagrangians FTUV/90-17, IFIC/90-14 (1990);
4. J. Prades andA. Pich: The decay η→π0h0 in two-Higgs-doublet models with a light scalar, FTUV/90-13, IFIC/90-10 (1990).
5. M. S. Alam et al.:Phys. Rev. D,40, 712 (1989).