@article{10_1090_S0894_0347_06_00515_7,
     author = {Helfgott, H. and Venkatesh, A.},
     title = {Integral points on elliptic curves and 3-torsion in class groups},
     journal = {Journal of the American Mathematical Society},
     pages = {527--550},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {2006},
     doi = {10.1090/S0894-0347-06-00515-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-06-00515-7/}
}