I am trying to get a better understanding of "real" $C^*$-algebras. I encountered them in the paper

D. Voiculescu, Dual algebraic structures, J. Operator Theory 17(1987), 85-98,

which cites

Roughly speaking, these "real" $C^*$-algebras are complexifications of real $C^*$-algebras. They are defined as complex $C^*$-algebras equipped with an additional antilinear multiplicative involution.

I would be grateful for any pointers to additional literature on these algebras. (The quotation marks and the star in their name make it more tricky to find them with google...).