@incollection{AST_1988__163-164__247_0,
     author = {Zieschang, Heiner},
     title = {On {Heegaard} diagrams of $3$-manifolds},
     booktitle = {On the Geometry of Differentiable Manifolds Rome, 23-27 juin 1986},
     series = {Ast\'erisque},
     pages = {247--280},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {163-164},
     year = {1988},
     zbl = {0674.57010},
     language = {en},
     url = {http://www.numdam.org/item/AST_1988__163-164__247_0/}
}