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@article{MM2_1982__39_154877, author = {Jochen Br\"uning}, title = {On the {Eigenvalue} problem of {T'Hooft.}}, journal = {Manuscripta mathematica}, pages = {125--146}, publisher = {mathdoc}, volume = {39}, year = {1982}, zbl = {0504.45004}, url = {http://geodesic.mathdoc.fr/item/MM2_1982__39_154877/} }
Jochen Brüning. On the Eigenvalue problem of T'Hooft.. Manuscripta mathematica, Tome 39 (1982), pp. 125-146. http://geodesic.mathdoc.fr/item/MM2_1982__39_154877/