@article{MAN_1973__206_162518,
     author = {Erik Lippa},
     title = {An {Elementary} {Approach} to {Hecke} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {237},
     publisher = {mathdoc},
     volume = {206},
     year = {1973},
     zbl = {0251.10022},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/MAN_1973__206_162518/}
}