1. The formalism used in this section is different from that used by Dawson; however, it is quite similar to the quasilinear formalism of W. E. Drummond and D. Pines.
2. L. M. Altshul and V. I. Karpman, presented at the Novosibirsk Conference on Many Body Theory (1965) (to be published).
3. W. Gröbner and N. Hofreiter,Integraltafel(Springer-Verlag, Berlin, 1963), Vol. 1, p. 63.