The productive dual differs from CA in that its use is optional, whereas the use of the CA dual was mandatory even in cases of implicitly dual reference.

The external skin of the building makes dual references to both tradition and the modern condition.

This is a dual reference to roadside memorials and to crosses that, in 1984, funded by Reverend Bernard Coffindaffer, began appearing on the sides of highways across the country.

Roszak extended this dual reference to figural depiction and industrial form in a remarkable series of works he termed bipolar constructions.

Sometimes abductees experience the sensation of being both human and alien at the same time, a phenomenon Joe Nyman calls "dual reference."

The name is a dual reference to Southern blotting and the geographical concept of the "Far East" (which includes Japan).

The most obvious yield is a dual reference to layers of earth and to the layers of fabric in a quilt.

It was the inanimate machine's robotic signal that another dual reference had been calculated.

Their name is a dual reference to the three M surnames, and also pun on the musical notation for a minor third.

The title is a dual reference to Rube Goldberg machines and the Goldberg Variations by Johann Sebastian Bach.