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@article{MM2_1990__69_1_155559, author = {Robert Hardt and Fang-Hua Lin}, title = {The {Singular} {Set} of an energy minimzing map from {B4} to {S2.}}, journal = {Manuscripta mathematica}, pages = {275--290}, publisher = {mathdoc}, volume = {69}, number = {1}, year = {1990}, zbl = {0713.58006}, url = {http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155559/} }
Robert Hardt; Fang-Hua Lin. The Singular Set of an energy minimzing map from B4 to S2.. Manuscripta mathematica, Tome 69 (1990) no. 1, pp. 275-290. http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155559/