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. 
@article{JMAG_2018_14_a2,
     author = {Thomas Kappeler and Yannick Widmer},
     title = {On spectral properties of the $L$ operator in the {Lax} pair of the {sine-Gordon} equation},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {452--509},
     publisher = {mathdoc},
     volume = {14},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2018_14_a2/}
}
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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. http://geodesic.mathdoc.fr/item/JMAG_2018_14_a2/