Geodesic
On spectral properties of the L operator in the Lax pair of the sine-Gordon equation
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 14 (2018), pp. 452-509.

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We analyze the periodic spectrum of the L operator in the Lax pair of the sine-Gordon equation in terms of the regularity of the potential. 
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Thomas Kappeler; Yannick Widmer. On spectral properties of the $L$ operator in the Lax pair of the sine-Gordon equation. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 14 (2018), pp. 452-509. https://geodesic-test.mathdoc.fr/item/JMAG_2018_14_a2/

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