Geodesic
Asymptotics of the density of states of hypoelliptic almost periodic operators
Sbornik. Mathematics, Tome 34 (1978) no. 4, pp. 425-447

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For a hypoelliptic differential operator with almost periodic coefficients asymptotics are found for the density of states, complete with a remainder term. Under certain conditions on the symbol of the operator the asymptotics imply an estimate on the length of the gaps in the given operator acting in $L^2(\mathbf R^n)$. Bibliography: 25 titles. 
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     author = {V. I. Bezyaev},
     title = {Asymptotics of the density of states of hypoelliptic almost periodic operators},
     journal = {Sbornik. Mathematics},
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     number = {4},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1978_34_4_a1/}
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V. I. Bezyaev. Asymptotics of the density of states of hypoelliptic almost periodic operators. Sbornik. Mathematics, Tome 34 (1978) no. 4, pp. 425-447. http://geodesic.mathdoc.fr/item/SM_1978_34_4_a1/