@article{MZ_1979__168_172872,
     author = {Stefan Hildebrandt},
     title = {Mathematical {Aspects} of 't {Hooft's} {Eigenvalue} {Problem} in {Two-Dimensional} {Quantum} {Chromodynamcis} {Part} {III.}},
     journal = {Mathematische Zeitschrift},
     pages = {223--240},
     publisher = {mathdoc},
     volume = {168},
     year = {1979},
     zbl = {0446.45007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1979__168_172872/}
}