@article{1029001657,
author = {Birman, Joan S. and Gonz\'alez-Acu na, F. and Montesinos, Jos\'e M.},
title = {Heegaard splittings of prime $3$-manifolds are not unique.},
journal = {Michigan Math. J.},
volume = {22},
number = {3},
year = {1976},
pages = { 97-103},
language = {en},
url = {http://dml.mathdoc.fr/item/1029001657}
}
Birman, Joan S.; González-Acu na, F.; Montesinos, José M. Heegaard splittings of prime $3$-manifolds are not unique.. Michigan Math. J., Tome 22 (1976) no. 3, pp. 97-103. http://gdmltest.u-ga.fr/item/1029001657/