Geodesic
Banach spaces which are semi-L-summands in their biduals.
Mathematische Annalen, Tome 289 (1991) no. 4, pp. 529-542.

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Mots-clés : a Banach space can be a semi-L-summand and not an L-summand in its bidual, unique best approximation, metric projection, infinite- dimensional sets of constant width, pseudoball, intersection property, proper M-ideals, nonlinear version of E. Behrends' L-M theorem 
@article{MAN_1991__289_4_164796,
     author = {Rafael Pay\'a and Angel Rodr{\'\i}guez Palacios},
     title = {Banach spaces which are {semi-L-summands} in their biduals.},
     journal = {Mathematische Annalen},
     pages = {529--542},
     publisher = {mathdoc},
     volume = {289},
     number = {4},
     year = {1991},
     zbl = {0712.46005},
     url = {http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164796/}
}
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Rafael Payá; Angel Rodríguez Palacios. Banach spaces which are semi-L-summands in their biduals.. Mathematische Annalen, Tome 289 (1991) no. 4, pp. 529-542. http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164796/