@article{MZ_1963__82_170171,
     author = {Chuan-Chih Hsiung},
     title = {Curvature and homology of {Riemannian} manifolds with boundary.},
     journal = {Mathematische Zeitschrift},
     pages = {67--81},
     publisher = {mathdoc},
     volume = {82},
     year = {1963},
     zbl = {0119.17202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170171/}
}