1. I.Yu. Kobzarev, L.B. Okun and M.B. Voloshin, Bubbles in metastable vacuum, Sov. J. Nucl. Phys. 20 (1975) 644 [
INSPIRE
].
2. M. Stone, The lifetime and decay of excited vacuum states of a field theory associated with nonabsolute minima of its effective potential, Phys. Rev. D 14 (1976) 3568 [
INSPIRE
].
3. P.H. Frampton, Consequences of vacuum instability in quantum field theory, Phys. Rev. D 15 (1977) 2922 [
INSPIRE
].
4. S.R. Coleman, The fate of the false vacuum. 1. Semiclassical theory, Phys. Rev. D 15 (1977) 2929 [Erratum ibid. D 16 (1977) 1248] [
INSPIRE
].
5. C.G. Callan Jr. and S.R. Coleman, The fate of the false vacuum. 2. First quantum corrections, Phys. Rev. D 16 (1977) 1762 [
INSPIRE
].