@article{M2AN_1972__6_3_99_0,
     author = {Alt, Ren\'e},
     title = {Br\`eves communications. {Deux} th\'eor\`emes sur la $A$-stabilit\'e des sch\'emas de {Runge-Kutta} simplement implicit\'es},
     journal = {Revue fran\c{c}aise d'automatique informatique recherche op\'erationnelle. Math\'ematique},
     pages = {99--104},
     publisher = {Dunod},
     address = {Paris},
     volume = {6},
     number = {R3},
     year = {1972},
     mrnumber = {356510},
     zbl = {0251.65055},
     language = {fr},
     url = {http://www.numdam.org/item/M2AN_1972__6_3_99_0/}
}