A directional compactification of the complex Fermi surface and isospectrality
Séminaire Goulaouic-Schwartz (1989-1990), Exposé no. 4, 9 p. 
@article{SEDP_1989-1990____A4_0,
     author = {B\"attig, D.},
     title = {A directional compactification of the complex {Fermi} surface and isospectrality},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:4},
     pages = {1--9},
     year = {1989-1990},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     mrnumber = {1073179},
     zbl = {0716.35082},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_1989-1990____A4_0/}
}
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Bättig, D. A directional compactification of the complex Fermi surface and isospectrality. Séminaire Goulaouic-Schwartz (1989-1990), Exposé no. 4, 9 p.. https://www.numdam.org/item/SEDP_1989-1990____A4_0/

[B] D. Bättig, A toroidal compactification of the Fermi-surface for the disrete Laplace operator. Preprint ETH Zürich 1989.

[BKT] D. Bättig, H. Knörrer, E. Trubowitz, A directional compactification of the complex Fermi surface. Preprint ETH Zürich 1989. | Zbl | MR | Numdam

[Bo] G. Borg, Eine Umkehrung der Sturm-Liouvilleschen Eigenwertaufgabe. Acta Math. 78, 1-96 (1946). | Zbl | MR

[KT] H. Knörrer, E. Trubowitz, A directional compactification of the complex Bloch variety. To appear in Comment. Math. Helvetici. | Zbl | MR