Part I
References
V. Arnold, Ordinary Differential Equations (Springer, Berlin, 1992)
A. Barone, F. Esposito, C.J. Magee, Theory and applications of the sine-gordon
equation. Riv. Nuovo Cim. 1, 227 (1971)
S. Coleman, Phys. Rev. D11, 2088 (1975)
S. Coleman, Phys. Rev. D 15, 2929 (1977)
S. Coleman, Aspects of Symmetry (Cambridge University Press, 1985)
R.F. Dashen, B. Hasslacher, A. Neveu, Phys. Rev. D10, 4130 (1974)
J. Fröhlich, The quantum theory of non-linear invariant wave equations, in Invariant
Wave Equations, G. Velo and A.S. Wightman eds., (Springer, Berlin, 1977)
H. Goldstein, Classical Mechanics, 2nd. ed. (Addison-Wesley, 1980)
J. Goldstone, Nuovo Cim. 19, 154 (1961)
J. Goldstone, R. Jackiw, Phys. Rev. D11, 1486 (1975)
J. Goldstone, A. Salam, S. Weinberg, Phys. Rev. 127, 965 (1962)
G.S. Guralnik, C.R. Hagen, T.W. Kibble, Broken symmetries and the goldstone
theorem, in Advances in Particle Physics, vol. 2, R.L. Cool and R.E. Marshak eds.,
(Interscience, New York, 1968)
R. Haag, Local Quantum Physics (Springer, Berlin, 1996)
R. Haag, D. Kastler, J. Math. Phys. 5, 848 (1964)
P.W. Higgs, Phys. Lett. 12, 132 (1964)
E.L. Hill, Rev. Mod. Phys. 23, 253 (1951)
R.M.F. Houtappel, H. Van Dam and E.P. Wigner, Rev. Mod. Phys. 37, 595 (1965)
K. Jörgens, Mat. Zeit. 77, 291 (1961)
References
V. Arnold, Ordinary Differential Equations (Springer, Berlin, 1992)
A. Barone, F. Esposito, C.J. Magee, Theory and applications of the sine-gordon
equation. Riv. Nuovo Cim. 1, 227 (1971)
S. Coleman, Phys. Rev. D11, 2088 (1975)
S. Coleman, Phys. Rev. D 15, 2929 (1977)
S. Coleman, Aspects of Symmetry (Cambridge University Press, 1985)
R.F. Dashen, B. Hasslacher, A. Neveu, Phys. Rev. D10, 4130 (1974)
J. Fröhlich, The quantum theory of non-linear invariant wave equations, in Invariant
Wave Equations, G. Velo and A.S. Wightman eds., (Springer, Berlin, 1977)
H. Goldstein, Classical Mechanics, 2nd. ed. (Addison-Wesley, 1980)
J. Goldstone, Nuovo Cim. 19, 154 (1961)
J. Goldstone, R. Jackiw, Phys. Rev. D11, 1486 (1975)
J. Goldstone, A. Salam, S. Weinberg, Phys. Rev. 127, 965 (1962)
G.S. Guralnik, C.R. Hagen, T.W. Kibble, Broken symmetries and the goldstone
theorem, in Advances in Particle Physics, vol. 2, R.L. Cool and R.E. Marshak eds.,
(Interscience, New York, 1968)
R. Haag, Local Quantum Physics (Springer, Berlin, 1996)
R. Haag, D. Kastler, J. Math. Phys. 5, 848 (1964)
P.W. Higgs, Phys. Lett. 12, 132 (1964)
E.L. Hill, Rev. Mod. Phys. 23, 253 (1951)
R.M.F. Houtappel, H. Van Dam and E.P. Wigner, Rev. Mod. Phys. 37, 595 (1965)
K. Jörgens, Mat. Zeit. 77, 291 (1961)