@article{1183555720,
author = {Johannson, Klaus},
title = {Heegaard surfaces in Haken 3-manifolds},
journal = {Bull. Amer. Math. Soc. (N.S.)},
volume = {23},
number = {1},
year = {1990},
pages = { 91-98},
language = {en},
url = {http://dml.mathdoc.fr/item/1183555720}
}
Johannson, Klaus. Heegaard surfaces in Haken 3-manifolds. Bull. Amer. Math. Soc. (N.S.), Tome 23 (1990) no. 1, pp. 91-98. http://gdmltest.u-ga.fr/item/1183555720/