@article{10_1090_S0894_0347_2011_00723_6,
     author = {Hein, Hans-Joachim},
     title = {Gravitational instantons from rational elliptic surfaces},
     journal = {Journal of the American Mathematical Society},
     pages = {355--393},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2012},
     doi = {10.1090/S0894-0347-2011-00723-6},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-2011-00723-6/}
}