López Molina, Juan A., and Jesús M.F. Castillo. “Dunford-Pettis-Like Properties of Projective and Natural Tensor Product Spaces”. Revista Matemática Complutense, vol. 6, no. 2, Jan. 1993, p. 233, https://doi.org/10.5209/rev_REMA.1993.v6.n2.17815.