中国科学院数学与系统科学研究院期刊网
AMS
Every Sub-Riemannian Manifold Is the Gromov–Hausdorff Limit of a Sequence Riemannian Manifolds
Yong Hong HUANG
Acta Mathematica Sinica . 2017, (11): 1565 -1568 .  DOI: 10.1007/s10114-017-4543-x