@article{MOMA_1989__108_2-3_178446,
     author = {Philippe Tondeur and Lieven Vanhecke},
     title = {Isometric {Reflections} with {Respect} to {Submanifolds} and the {Ricci} {Operator} of {Geodesic} {Spheres.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {211--218},
     publisher = {mathdoc},
     volume = {108},
     number = {2-3},
     year = {1989},
     zbl = {0712.53023},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1989__108_2-3_178446/}
}