The Kronig–Penney model of an electron moving in a periodic potential is solved by the so-called tail-cancellation method. The problem also serves as a simple illustration of the tail-cancellation method itself.

1.
C. Kittel, Introduction to Solid State Physics (Wiley, New York, 1996), 7th ed., p. 180.
2.
S.
Singh
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Kronig–Penney Model in Reciprocal Lattice Space
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W. J.
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4.
See, for example, H. L. Skriver, The LMTO Method (Springer, New York, 1983).
5.
N. W. Ashcroft and N. D. Mermin, Solid State Physics (Saunders, Philadelphia, 1976), p. 148. 
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