Geodesic
Approximation of infinite-zone potentials by finite-zone potentials
Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 55-87

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In this paper it is proved that each infinite-zone potential of the class considered in the paper “Almost periodicity of infinite-zone potentials” (Izv. Akad. Nauk SSSR Ser. Mat., 1981, v. 45, № 2, pp. 291–320) is the uniform limit of finite-zone potentials on the entire real line. The proof is based on a detailed study of the problem of Jacobi inversion on a two-sheeted Riemann surface with an infinite number of branch points. Bibliography: 5 titles. 
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B. M. Levitan. Approximation of infinite-zone potentials by finite-zone potentials. Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 55-87. http://geodesic.mathdoc.fr/item/IM2_1983_20_1_a3/