Wb. Johnson et M. Zippin, EXTENSION OF OPERATORS FROM WEAK-ASTERISK-CLOSED SUBSPACES OF L(1) INTO C(K) SPACES, Studia Mathematica, 117(1), 1995, pp. 43-55
It is proved that every operator from a weak-closed subspace of l(1)
into a space C(K) of continuous functions on a compact Hausdorff space
K can be extended to an operator from l(1) to C(K).