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Список литературы
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| 1. |
Seifert H., Threlfall W., Lehrbuch der Topologie, Teubner, Leipzig, 1934 |
| 2. |
Stallings J. R., “On the recursiveness of sets of presentations of 3-manifold groups”, Fund. Math., 1962
vol 51, 191–194 |
| 3. |
Jaco W., “Heergaard splitting homomorphisms”, Trans. Amer. Math. Soc., 144 (1969), 365–379 |