@article{M2AN_1975__9_1_5_0,
     author = {Escofier, B. and Le Roux, B.},
     title = {Rotation du sous-espace invariant d{\textquoteright}un endomorphisme sym\'etrique de $\mathbf {R}^n$ par une perturbation sym\'etrique},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {5--8},
     publisher = {Dunod},
     address = {Paris},
     volume = {9},
     number = {R1},
     year = {1975},
     mrnumber = {427340},
     zbl = {0331.50006},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1975__9_1_5_0/}
}