Isometric homotopy and codimension-two isometric immersions of the $n$-sphere into Euclidean space

On Spherical Image Maps Whose Jacobians Do Not Change Sign

Philip Hartman, Louis Nirenberg · American Journal of Mathematics · 1959 · 265 citations

Integral Geometry, Global Analysis, Change Sign +1

The Classification of Immersions of Spheres in Euclidean Spaces

Stephen T. Smale · Annals of Mathematics · 1959 · 241 citations

Global Geometry, Geometry, Riemannian Geometry +2

Immersions of Manifolds

Morris W. Hirsch · Transactions of the American Mathematical Society · 1959 · 88 citations

Geometry, Riemannian Geometry, Manifold Modeling +4

Isometric Immersions of Constant Mean Curvature and Triviality of the Normal Connection

Joseph Erbacher · Nagoya Mathematical Journal · 1972 · 51 citations · Full text

Global Geometry, Geometric Partial Differential Equation, Geometry +10

Isometric immersion of flat Riemannian manifolds in Euclidean space.

Barrett O’Neill · The Michigan Mathematical Journal · 1962 · 22 citations · Full text

Euclidean Space, Global Geometry, Geometry +2