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@article{IM_1982__66_142865, author = {Harald Hefter}, title = {Dehnungsuntersuchungen an {Sph\"arenabbildungen.}}, journal = {Inventiones mathematicae}, pages = {1--10}, publisher = {mathdoc}, volume = {66}, year = {1982}, zbl = {0526.55015}, url = {http://geodesic.mathdoc.fr/item/IM_1982__66_142865/} }
Harald Hefter. Dehnungsuntersuchungen an Sphärenabbildungen.. Inventiones mathematicae, Tome 66 (1982), pp. 1-10. http://geodesic.mathdoc.fr/item/IM_1982__66_142865/