@article{GDZPPN002331489, title = {Heegaard Splittings and Branched Coverings of B3.}, journal = {Mathematische Annalen}, volume = {280}, year = {1988}, pages = {531-544}, zbl = {0627.57007}, url = {http://dml.mathdoc.fr/item/GDZPPN002331489} }
Bleiler, Steven A.; Moriah, Yoav. Heegaard Splittings and Branched Coverings of B3.. Mathematische Annalen, Tome 280 (1988) pp. 531-544. http://gdmltest.u-ga.fr/item/GDZPPN002331489/