@article{GDZPPN002442264, title = {Critical Riemannian 4-manifolds.}, journal = {Mathematische Zeitschrift}, volume = {212}, year = {1993}, pages = {601-626}, zbl = {0801.53030}, url = {http://dml.mathdoc.fr/item/GDZPPN002442264} }
Chang, Shun-Cheng. Critical Riemannian 4-manifolds.. Mathematische Zeitschrift, Tome 212 (1993) pp. 601-626. http://gdmltest.u-ga.fr/item/GDZPPN002442264/