@article{MM2_1978__26_154598,
     author = {Hans Lewy},
     title = {Expansion of solutions of {T'Hooft's} equation. {A} study in the confluence of analytic boundary conditions.},
     journal = {Manuscripta mathematica},
     pages = {411--422},
     publisher = {mathdoc},
     volume = {26},
     year = {1978},
     zbl = {0439.34056},
     url = {http://geodesic.mathdoc.fr/item/MM2_1978__26_154598/}
}