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On the ground state of the Hamiltonian in the simplest model of quantum-field theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 7 (1971) no. 1, pp. 20-29
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Goldstone (Nuovo Cimento, 19, 154 (1961)) first considered an example of a quantum-field theory with a degenerate ground state. In the present paper a detailed analysis is made fromthis point of view of the simplest example of quantum-field theory in two-dimensional space-time; the absence of nontrivial divergences enables one to dispense with renormal- ization theory and the theory therefore gains in cogency and lucidity. 
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L. G. Zastavenko. On the ground state of the Hamiltonian in the simplest model of quantum-field theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 7 (1971) no. 1, pp. 20-29. http://geodesic.mathdoc.fr/item/TMF_1971_7_1_a2/

[1] I. Goldstone, Nuovo Cim., 19 (1961), 154 | DOI | MR | Zbl

[2] N. N. Bogolyubov, D. V. Shirkov, Vvedenie v teoriyu kvantovannykh polei, Gostekhizdat, 1957 | MR

[3] L. G. Zastavenko, Preprint OIYaI, 3113, 1967 | MR