MathSciNet bibliographic data MR1639876 (99h:57039) 57N10 (57M05) Rubinstein, J. Hyam; Wang, Shicheng $\pi\sb 1$$\pi\sb 1$-injective surfaces in graph manifolds. Comment. Math. Helv. 73 (1998), no. 4, 499–515. Article

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