论文信息 - Relative Euler number and finite covers of graph manifolds - 字舞流文

Relative Euler number and finite covers of graph manifolds

[1] W. Thurston. Three dimensional manifolds, Kleinian groups and hyperbolic geometry , 1982 .

[2] F. Waldhausen. Eine Klasse von 3-dimensionalen Mannigfaltigkeiten. II , 1967 .