Geodesic
Structure of the spectrum of the Schrödinger operator with almost-periodic potential in the vicinity of its left edge
Funkcionalʹnyj analiz i ego priloženiâ, Tome 19 (1985) no. 1, pp. 42-48 
Ya. G. Sinai. Structure of the spectrum of the Schrödinger operator with almost-periodic potential in the vicinity of its left edge. Funkcionalʹnyj analiz i ego priloženiâ, Tome 19 (1985) no. 1, pp. 42-48. http://geodesic.mathdoc.fr/item/FAA_1985_19_1_a5/
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