D. DeProspo, S.I. Lyutov, M. Kalelkar et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|1994
S. Willocq, N.K. Rao, E. Clayton et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|1993