@article{MS2_1967__21_166023,
     author = {Asmus L. Schmidt},
     title = {Farey {Triangles} and {Farey} {Quadrangels} in the {Complex} {Plane.}},
     journal = {Mathematica Scandinavica},
     pages = {241--295},
     publisher = {mathdoc},
     volume = {21},
     year = {1967},
     zbl = {0172.06601},
     url = {http://geodesic.mathdoc.fr/item/MS2_1967__21_166023/}
}