Sj. Bernau et Cb. Huijsmans, THE ORDER BIDUAL OF ALMOST F-ALGEBRAS AND D-ALGEBRAS, Transactions of the American Mathematical Society, 347(11), 1995, pp. 4259-4275
It is shown in this paper that the second order dual A'' of an Archime
dean (almost) f-algebra A, equipped with the Arens multiplication, is
again an (almost) S-algebra. Also, the order continuous bidual (A')'(n
) of an Archimedean d-algebra A is a d-algebra. Moreover, if the d-alg
ebra A is commutative or has positive squares, then A'' is again a d-a
lgebra.