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@article{MM2_1989__65_3_155454, author = {Mariano Giaquinta and Giuseppe Modica}, title = {The {Dirichlet} {Energy} of {Mappings} with values into the sphere.}, journal = {Manuscripta mathematica}, pages = {489--507}, publisher = {mathdoc}, volume = {65}, number = {3}, year = {1989}, zbl = {0678.49006}, url = {http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155454/} }
Mariano Giaquinta; Giuseppe Modica. The Dirichlet Energy of Mappings with values into the sphere.. Manuscripta mathematica, Tome 65 (1989) no. 3, pp. 489-507. http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155454/