@article{10_1090_S0894_0347_00_00344_1,
     author = {Abreu, Miguel and McDuff, Dusa},
     title = {Topology of symplectomorphism groups of rational ruled surfaces},
     journal = {Journal of the American Mathematical Society},
     pages = {971--1009},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2000},
     doi = {10.1090/S0894-0347-00-00344-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-00-00344-1/}
}