@article{M2AN_1971__5_3_127_0,
     author = {Tartar, Luc},
     title = {Br\`eve communication. {Une} nouvelle caract\'erisation des $M$ matrices},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {127--128},
     publisher = {Dunod},
     address = {Paris},
     volume = {5},
     number = {R3},
     year = {1971},
     mrnumber = {308157},
     zbl = {0268.15002},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/M2AN_1971__5_3_127_0/}
}