@article{GDZPPN002097745,
title = {Pinching Theorem for the First Eigenvalue on Positively Curved Four Manifolds.},
journal = {Inventiones mathematicae},
volume = {69},
year = {1982},
pages = {35-38},
zbl = {0496.53032},
url = {http://dml.mathdoc.fr/item/GDZPPN002097745}
}
Li, Peter; Treibergs, Andrejs E. Pinching Theorem for the First Eigenvalue on Positively Curved Four Manifolds.. Inventiones mathematicae, Tome 69 (1982) pp. 35-38. http://gdmltest.u-ga.fr/item/GDZPPN002097745/