@article{105344, author = {Franti\v sek Charv\'at}, title = {On problems concerning uniqueness of the extension of linear operations on linear spaces}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {012}, year = {1971}, pages = {271-280}, zbl = {0232.47014}, mrnumber = {0284826}, language = {en}, url = {http://dml.mathdoc.fr/item/105344} }
Charvát, František. On problems concerning uniqueness of the extension of linear operations on linear spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 012 (1971) pp. 271-280. http://gdmltest.u-ga.fr/item/105344/
Uniqueness of Hahn-Banach extensions and unique best approximation, TAMS 95 (1960), 238-255. (1960) | MR 0113125 | Zbl 0096.31102
On problems concerning extension of linear operations on linear spaces, Comment. Math. Univ. Carolinae 12 (1971), 105-115. (1971) | MR 0298391