@article{10_4153_CMB_2003_026_2,
     author = {Oh, Seungsang},
     title = {Reducing {Spheres} and {Klein} {Bottles} after {Dehn} {Fillings}},
     journal = {Canadian mathematical bulletin},
     pages = {265--267},
     year = {2003},
     volume = {46},
     number = {2},
     doi = {10.4153/CMB-2003-026-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-026-2/}
}