@article{articleab3ce52a,
title   = {Closed hypersurfaces of S4 with two constant curvature functions},
author = {Almeida, Sebastião C. de and Brito, Fabiano Gustavo Braga and Sousa Junior, Luiz Amancio M.},
year = {2007},
doi = {10.1007/s00025-006-0232-2},
journal   = {Results in mathematics}
}