@article{IM_1983__74_143061,
     author = {I.P. Malta and M.J. Pacifico},
     title = {Breaking {Cycles} on {Surfaces.}},
     journal = {Inventiones mathematicae},
     pages = {43--62},
     publisher = {mathdoc},
     volume = {74},
     year = {1983},
     zbl = {0536.58018},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__74_143061/}
}