@article{IM_1989__95_3_143664,
     author = {Joel Hass and Charles Frohman},
     title = {Unstable minimal surfaces and {Heegaard} splittings.},
     journal = {Inventiones mathematicae},
     pages = {529--540},
     publisher = {mathdoc},
     volume = {95},
     number = {3},
     year = {1989},
     zbl = {0678.57009},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__95_3_143664/}
}