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@article{IM_1982__66_142867, author = {Peter Li and Andrejs E. Treibergs}, title = {Pinching {Theorem} for the {First} {Eigenvalue} on {Positively} {Curved} {Four} {Manifolds.}}, journal = {Inventiones mathematicae}, pages = {35--38}, publisher = {mathdoc}, volume = {66}, year = {1982}, zbl = {0496.53032}, url = {http://geodesic.mathdoc.fr/item/IM_1982__66_142867/} }
Peter Li; Andrejs E. Treibergs. Pinching Theorem for the First Eigenvalue on Positively Curved Four Manifolds.. Inventiones mathematicae, Tome 66 (1982), pp. 35-38. http://geodesic.mathdoc.fr/item/IM_1982__66_142867/