@article{MAN_1993__295_1_165057,
     author = {Martin Scharlemann and Abigail Thompson},
     title = {Heegaard splittings of (surface) x {I} are standars.},
     journal = {Mathematische Annalen},
     pages = {549--564},
     publisher = {mathdoc},
     volume = {295},
     number = {1},
     year = {1993},
     zbl = {0814.57010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1993__295_1_165057/}
}