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References
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| 1. |
S. V. Matveev, A. T. Fomenko, Algoritmicheskie i kompyuternye metody v trekhmernoi topologii, Izd-vo MGU, M., 1991 |
| 2. |
Y. Moriah, J. Schultens, “Irreducible Heegaard splittings of Seifert fibered spaces are either vertical or horizontal”, Topology, 37:5 (1998), 1089–1112 |
| 3. |
J. Schultens, “Heegaard splittings of graph manifolds”, Geometry and Topology, 8 (2005), 831—876 |