[P1] U. Pinkall, Tight surfaces and regular homotopy,
       Topology 25 (1986) 475-481.
The author finds tight immersions of all but finitely many of the classes of immersed surfaces under regular homotopy (but his example of T#S#S#S is in error, it is actually K_o#T#S#S). He also shows that there is no tight immersion of the twisted torus, T, or of K+#B.

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10/12/94 dpvc@geom.umn.edu -- The Geometry Center