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Contents § 1. Introduction § 2. A multi-point vector-valued analogue of the Baker-Akhiezer function § 3. The two-dimensional Schrödinger operator and two-point functions of Baker-Akhiezer type with separate variables § 4. Deformations of holomorphic bundles § 5. Finite-zone solutions of KP equations of rank 2 and genus 1 § 6. Equations of zero curvature for algebraic sheaves of operators § 7. APPENDIX. Algebraic families of commuting flows References
Krichever et al. (Wed,) studied this question.