@article{10_4064_cm_57_1_89_92,
     author = {Ryszard Deszcz and Wies{\l}aw Grycak},
     title = {On manifolds satisfying some curvature conditions},
     journal = {Colloquium Mathematicum},
     pages = {89--92},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {1989},
     doi = {10.4064/cm-57-1-89-92},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-57-1-89-92/}
}