He has researched and written extensively on art history in particular.

I have extensively researched what factors drive it up and down.

So, I mean, this is something that's been researched extensively.

The most extensively researched is the gap between white and black Americans.

The system in humans has been the most extensively researched and is the best understood.

Vitamin C's effect on the common cold has been extensively researched.

Then he started extensively researching everyone mentioned in the case files.

Though extensively researched, this view is not accepted by Leonard's family.

American history from the seventeenth century to the present day is extensively researched and taught.

He had a strong belief in conservative investments based on extensively researched companies.