@article{CM_1984__51_3_275_0,
     author = {Cremona, J. E.},
     title = {Hyperbolic tessellations, modular symbols, and elliptic curves over complex quadratic fields},
     journal = {Compositio Mathematica},
     pages = {275--324},
     publisher = {Martinus Nijhoff Publishers},
     volume = {51},
     number = {3},
     year = {1984},
     mrnumber = {743014},
     zbl = {0546.14027},
     language = {en},
     url = {http://www.numdam.org/item/CM_1984__51_3_275_0/}
}