This is the classic theory, well known to spirit channelers and ghost busters all over the world.

According to Darwin's classic theory of evolution, several generations are required for adaptation to occur.

Family structure among urban, rural and farm populations: classic sociological theory revisited.

The view of the early church, which Aulén insists must be seen as the classic theory, he calls the 'dramatic'.

In principle, economic integration is a good thing: classic theory suggests that freer trade should benefit all participants.

The parts of the world that participated in this vast experiment in classic economic theory were greatly transformed.

The classic theory explains aging in terms of natural selection and fertility through the life cycle.

These collective works contribute to the "classic theory" of crowd psychology.

The classic statistical theory first developed by Flory rested on two critical assumptions.

More recent measurements do tend to validate the classic theory, for the most part.