1. Downing, J. S.: Decomposing compact 3–manifolds into homeomorphic handlebodies. Proc. Amer. Math. Soc., 24, 241–244 (1970)
2. Roeling, L. G.: The genus of an orientable 3–manifold with connected boundary. Illinois J. Math., 17, 558–562 (1973)
3. Suzuki, S.: Handlebody splittings of compact 3–manifolds with boundary, Proceedings of Knot Theory, 1999 in Toronto
4. Jaco, W.: Lectures on three–manifold topology, Regional Conference Series in Mathematics. Amer. Math. Soc., 43, 1–64 (1981)
5. Hempel, J.: 3–manifolds, Ann of Math Studies, 86, Princeton Univ. Press Princeton, NJ, 1976