Geodesic
$L^2$-Summand Vectors and Complemented Hilbertizable Subspaces
Bollettino della Unione matematica italiana, Série 8, 10B (2007) no. 3, pp. 1143-1148.

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In this paper, we show a necessary and sufficient condition for a real Banach space to have an infinite dimensional subspace which is hilbertizable and complemented using techniques related to $L^2$-summand vectors.
In questo articolo, mostriamo una condizione necessaria e sufficiente affinché uno spazio di Banach reale abbia un sottospazio infinito dimensionale il quale sia hilbertizzabile e complementato, usando tecniche relazionate con vettori $L^2$-summand. 
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Aizpuru, Antonio; García-Pacheco, Francisco J. $L^2$-Summand Vectors and Complemented Hilbertizable Subspaces. Bollettino della Unione matematica italiana, Série 8, 10B (2007) no. 3, pp. 1143-1148. http://geodesic.mathdoc.fr/item/BUMI_2007_8_10B_3_a45/

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