@article{10_4064_ap_34_1_53_61,
     author = {Andrzej Derdzi\'nski},
     title = {On some condition for a submanifold of {Euclidean} space to be a sphere},
     journal = {Annales Polonici Mathematici},
     pages = {53--61},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1977},
     doi = {10.4064/ap-34-1-53-61},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-34-1-53-61/}
}