@article{10_4064_aa131_1_5,
     author = {Patrick Ingram},
     title = {Approximating algebraic numbers by $j$-invariants
 of elliptic curves},
     journal = {Acta Arithmetica},
     pages = {57--68},
     publisher = {mathdoc},
     volume = {131},
     number = {1},
     year = {2008},
     doi = {10.4064/aa131-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa131-1-5/}
}