1991 · A. Bartl, W. Majerotto, et al. · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 37
1999 · Mayumi Aoki, Gi-Chol Cho, et al. · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 13