Publisher
Springer Berlin Heidelberg
Reference41 articles.
1. J.Devreese, J. De Sitter, M.Goovaerts, Phys.Rev. B5, 2367 (1972)
2. R.P.Feynman, Phys.Rev. 97, 660 (1955)
3. K.Thornber, Phys,Rev. B9, 1929 (1971)
4. J. De Sitter, L.F.Lemmens, J.Devreese, unpublished
5. A.B.Kunz, J.T.Devreese, T.C.Collins, J.Phys. C5, 3259 (1972)