1. Choquet-Bruhat, Y., and D. Christodoulou (1982), Ann. de l'Ec. Norm Sup., Ser. 4, 14, 481–500
2. Choquet-Bruhat, Y., and I.E. Segal (1982), C.R.Paris, 294, 225–230
3. Choquet-Bruhat, Y.,S.M. Paneitz, and I.E. Segal (1983), Jour. Funct. Anal., in press
4. Dionne, P., (1962), J. Anal. Jerusalem
5. Eardley, D., and V. Moncrief (1982), Comm.Math.Phys. 83, 171–212