@article{GT_1999_3_1_a13,
     author = {Petersen, Peter and Wilhelm, Frederick},
     title = {Examples of {Riemannian} manifolds with positive curvature almost everywhere},
     journal = {Geometry & topology},
     pages = {331--367},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1999},
     doi = {10.2140/gt.1999.3.331},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.1999.3.331/}
}