@article{IM_1975__28_142320,
     author = {Frans Keune},
     title = {(t2 - {t)-Reciprocities} on the {Affine} {Line} and {Matsumoto's} {Theorem.}},
     journal = {Inventiones mathematicae},
     pages = {185--192},
     publisher = {mathdoc},
     volume = {28},
     year = {1975},
     zbl = {0331.18017},
     url = {http://geodesic.mathdoc.fr/item/IM_1975__28_142320/}
}