1. Nelson, E.: A quartic interaction in two dimensions. In: Mathematical theory of elementary particles (eds. R. Goodman, I. Segal). Cambridge: MIT Press 1966
2. Benfatto, G., Cassandro, M., Gallavotti, G., Nicoló, F., Olivieri, E., Presutti, E., Scacciatelli, E.: Commun. Math. Phys.59, 143 (1978); Related works are: Gallavotti, G.: Memorie dell'Accademia dei LinceiXV, 23 (1978); Gallavotti, G.: Ann. Matematica Pura Appl.CXX, 1?23 (1979)
3. Guerra, F.: Phys. Rev. Lett.28, 1213?1215 (1972)
4. Glimm, J., Jaffe, A.: Fortschr. Physik21, 327?376 (1973)
5. Glimm, J., Jaffe, A., Spencer, T.: The particle structure of the weakly coupledP(?)2 model and other applications. In: Lecture Notes in Physics, Vol. 25 (eds. G. Velo, A. Wightman). Berlin, Heidelberg, New York: Springer 1973