[CL1] S. S. Chern and R. K. Lashof, On the total curvature of immersed manifolds I, Amer. J. Math. 79 (1957) 306-318. [CL2] S. S. Chern and R. K. Lashof, On the total curvature of immersed manifolds II, Mich. Math. J. 5 (1958) 5-12.
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The Geometry Center