@article{ASNSP_1972_3_26_1_233_0, author = {Kowalski, Old\v rich}, title = {Properties of hypersurfaces which are characteristic for spaces of constant curvature}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {233--245}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 26}, number = {1}, year = {1972}, zbl = {0233.53009}, mrnumber = {362156}, language = {en}, url = {archive.numdam.org/item/ASNSP_1972_3_26_1_233_0/} }
Kowalski, Oldřich. Properties of hypersurfaces which are characteristic for spaces of constant curvature. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 1, pp. 233-245. http://archive.numdam.org/item/ASNSP_1972_3_26_1_233_0/
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