@article{GDZPPN002334607,
title = {On the number of minimal two-spheres of small area in manifolds with curvature bounded above.},
journal = {Mathematische Annalen},
volume = {287},
year = {1990},
pages = {323-344},
zbl = {0694.53053},
url = {http://dml.mathdoc.fr/item/GDZPPN002334607}
}
Moore, John Douglas. On the number of minimal two-spheres of small area in manifolds with curvature bounded above.. Mathematische Annalen, Tome 287 (1990) pp. 323-344. http://gdmltest.u-ga.fr/item/GDZPPN002334607/