Algebraic & Geometric Topology Volume 6 (2006)

F LEI, G YANG, A lower bound of genus of amalgamations of Heegaard splittings, Mathematical Proceedings of the Cambridge Philosophical Society 146 (2009) 615

R Qiu, T Kobayashi, The amalgamation of high distance Heegaard splittings is always efficient, Mathematische Annalen 341 (2008) 707

S A Taylor, On non-compact Heegaard splittings, Algebraic & Geometric Topology 7 (2007) 603

G Yang, F Lei, Amalgamations of Heegaard splittings in 3–manifolds without some essential surfaces, Algebraic & Geometric Topology 9 (2009) 2041