1. Wegner, F.: J. Math. Phys.12, 2259 (1971)
2. Wilson, K.G.: Phys. Rev. D10, 2445 (1974)
3. Jaffe, A.: Lattice instantons: what they are and why they are important; de Angelis, G.F., de Falco, D., Guerra, E.: Gauge Fields on the lattice; Osterwalder, K., Seiler, E.: Lattice gauge theories; Frohlich, J.: Some frontiers in constructive quantum field theory and equilibrium statistical mechanics. In: Mathematical problems in theoretical physics. Dell'Antonio, G.F., Doplicher, S., Jona-Lasinio, G., (eds.). Lecture notes in physics, Vol. 80. Berlin, Heidelberg, New York: Springer 1978
4. Balian, R., Drouffe, J.M., Itzykson, C.: Phys. Rev. D10, 3376 (1974); D11, 2098 (1975); and D11, 2104 (1975)
5. Osterwalder, K., Seiler, E.: Ann. Phys.110, 440 (1978)