Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1972__22_4_a2, author = {Fut\'a\v{s}, Eugen}, title = {Extension of {Linear} {Operators}}, journal = {Mathematica slovaca}, pages = {271--281}, publisher = {mathdoc}, volume = {22}, number = {4}, year = {1972}, mrnumber = {0338313}, zbl = {0257.47006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1972__22_4_a2/} }
Futáš, Eugen. Extension of Linear Operators. Mathematica slovaca, Tome 22 (1972) no. 4, pp. 271-281. http://geodesic.mathdoc.fr/item/MASLO_1972__22_4_a2/