@article{M2AN_1969__3_1_35_0,
     author = {Polak, E. and Ribiere, G.},
     title = {Note sur la convergence de m\'ethodes de directions conjugu\'ees},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {35--43},
     publisher = {Dunod},
     address = {Paris},
     volume = {3},
     number = {R1},
     year = {1969},
     mrnumber = {255025},
     zbl = {0174.48001},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1969__3_1_35_0/}
}