@article{MAN_1986__276_164226,
     author = {M. Strake},
     title = {Curvature {Increasing} {Metric} {Variations.}},
     journal = {Mathematische Annalen},
     pages = {633--642},
     publisher = {mathdoc},
     volume = {276},
     year = {1986},
     zbl = {0616.53036},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__276_164226/}
}