Bolsinov, Alexey Dullin, Holger R. Veselov, Alexander Spectra of Sol-manifolds: arithmetic and quantum monodromy Spectra of Sol-manifolds: arithmetic and quantum monodromy untagged;Quantum Mechanics;Mathematical Sciences not elsewhere classified 2005-08-16
    https://repository.lboro.ac.uk/articles/preprint/Spectra_of_Sol-manifolds_arithmetic_and_quantum_monodromy/9380084