Flow-spines and Seifert fibred structure of 3-manifolds (Q1111200)

The concept of a flow-spine of a closed 3-manifold M was introduced by the author, Tokyo J. Math. 9, No.2, 505-525 (1986). In this paper, we shall give a sufficient condition for M represented by a flow-spine to be Seifert fibred (Theorem 1 in {\S} 2). In {\S} 3 the orbit manifold and exceptional fibres are completely determined by a DS-diagram which is induced by a flow-spine. We give an example in {\S} 4. And in {\S} 5, we study Seifert fibred submanifolds and embedded tori determined by a DS- diagram.