Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1967__3_2_a2, author = {Havel, V\'aclav}, title = {Free extensions of coupled systems}, journal = {Archivum mathematicum}, pages = {65--68}, publisher = {mathdoc}, volume = {03}, number = {2}, year = {1967}, mrnumber = {0222760}, zbl = {0205.24403}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1967__3_2_a2/} }
Havel, Václav. Free extensions of coupled systems. Archivum mathematicum, Tome 03 (1967) no. 2, pp. 65-68. http://geodesic.mathdoc.fr/item/ARM_1967__3_2_a2/