@article{CMH_1989__64_1_140147,
     author = {Viktor Schroeder and Martin Strake},
     title = {Rigidity of convex domains in manifolds with nonnegative {Ricci} and sectional curvature.},
     journal = {Commentarii mathematici Helvetici},
     pages = {173--186},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1989},
     zbl = {0692.53020},
     url = {http://geodesic.mathdoc.fr/item/CMH_1989__64_1_140147/}
}