MathSciNet bibliographic data MR467314 (57 #7173) 46H05 Esterle, Jean An algebra norm on \$l\sp{2}\$$l\sp{2}$ whose restriction to \$l\sp{1}\$$l\sp{1}$ is the usual \$l\sp{1}\$$l\sp{1}$-norm. Proc. Amer. Math. Soc. 69 (1978), no. 2, 303–307. Article

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