1. P. Heller,Proc. Conf. on Critical Phenomena, Washington, 1965, M. S. Green and J. V. Sengers, eds.,Reports on Prog. in Phys. 30, 731 (1967).
2. A. M. Polyakov,Zh. Eksperim. i Teor. Fiz. 55, 1026 (1968); A. A. Migdal,Zh. Eksperim. i Teor. Fiz. 55, 1964 (1968).
3. R. A. Ferrell, ?Field Theory of Phase Transitions,?International Symposium on Contemporary Physics, Trieste, June 1968 (to be published);
4. University of Maryland Department of Physics and Astronomy Technical Report no. 848 (July 1968). See bibliography for other work in the field.
5. M. E. Fisher,International Symposium on Contemporary Physics, Trieste, June 1968 (to be published);