@article{MAN_1990__287_1_164685,
     author = {Shinji Fukuhara and Yukio Matsumoto},
     title = {Casson's invariant of {Seifert} homology 3-spheres.},
     journal = {Mathematische Annalen},
     pages = {275--286},
     publisher = {mathdoc},
     volume = {287},
     number = {1},
     year = {1990},
     zbl = {0674.57014},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__287_1_164685/}
}