@article{CMH_1993__68_2_140298,
     author = {Jean-Pierre Otal and J.W. Morgan},
     title = {Relative growth rates of closed geodesics on a surface under varying hyperbolic structures.},
     journal = {Commentarii mathematici Helvetici},
     pages = {171--208},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1993},
     zbl = {0795.57009},
     url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140298/}
}