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@article{MZ_1993__214_1_174590, author = {Shun-Cheng Chang}, title = {Critical {Riemannian} 4-manifolds.}, journal = {Mathematische Zeitschrift}, pages = {601--626}, publisher = {mathdoc}, volume = {214}, number = {1}, year = {1993}, zbl = {0801.53030}, url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174590/} }
Shun-Cheng Chang. Critical Riemannian 4-manifolds.. Mathematische Zeitschrift, Tome 214 (1993) no. 1, pp. 601-626. http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174590/