@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040085,
 author = {Sato, Yoshihisa},
 issue = {4},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {Feb},
 pages = {461--491},
 title = {2-spheres of square -1 and the geography of genus-2 Lefschetz fibrations},
 volume = {15},
 year = {2009}
}