Milnor, John W. (1961). «Two complexes which are homeomorphic but combinatorially distinct». Annals of Mathematics74 (2): 575–590. doi:10.2307/1970299. MR133127.
Hamilton, Richard S. (1997). «Four-manifolds with positive isotropic curvature». Communications in Analysis and Geometry5 (1): 1–92. MR1456308. Zbl0892.53018.
Milnor, John W. (1961). «Two complexes which are homeomorphic but combinatorially distinct». Annals of Mathematics74 (2): 575–590. doi:10.2307/1970299. MR133127.
Hamilton, Richard S. (1997). «Four-manifolds with positive isotropic curvature». Communications in Analysis and Geometry5 (1): 1–92. MR1456308. Zbl0892.53018.