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[1]Lacey, H. E., Isometric Theory of Classical Banach Spaces, Berlin-Heidelberg-New York: Springer-Verlag, 1974.[2]Michael, E., Pelczynski, A., Separable spaces which admit approximations, Isreal. J. Math., 1966, 4: 189.[3]Ding Guanggui, Topics on the app