@article{MZ_1988__199_1_173982,
     author = {Joel Hass},
     title = {Surface {Minimizing} {Area} in {Their} {Homology} {Class} and {Group} {Actions} on {3-Manifolds.}},
     journal = {Mathematische Zeitschrift},
     pages = {501--510},
     publisher = {mathdoc},
     volume = {199},
     number = {1},
     year = {1988},
     zbl = {0715.57005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173982/}
}