“…It follows then that a Levi nondegenerate hypersurface M is (k, l)-spherical at one point iff it has this property at all points and we simply call M a (k, l)-spherical hypersurface. Similar extension result holds if instead of Levi nondegeneracy one assumes that M is essentially finite, a condition on the so-called Segre map of M generalizing Levi nondegeneracy, see [23] and [12]. Using arguments similar to those in [12] one can further generalize Pinchuk's theorem to the case when M is merely minimal in the sense of Tumanov [26], i.e., when M does not contain any germs of complex hypersurfaces, see [21].…”