@article{10_1090_S0894_0347_97_00236_1,
     author = {Cooper, D. and Long, D. and Reid, A.},
     title = {Essential closed surfaces in bounded 3-manifolds},
     journal = {Journal of the American Mathematical Society},
     pages = {553--563},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1997},
     doi = {10.1090/S0894-0347-97-00236-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-97-00236-1/}
}