Statistical Analysis of Feynman Diagrams
Carl M. Bender and Tai Tsun Wy
Phys. Rev. Lett. 37, 117 (1976) - Published 19 July, 1976
Phase Transitions in the Quantum Heisenberg Model
Freeman J. Dyson, Elliott H. Lieb, and Barry Simon
Phys. Rev. Lett. 37, 120 (1976) - Published 19 July, 1976