The reason for this variation has not been established conclusively.

The responsibility for the shooting has not been conclusively established.

I like to establish conclusively that a person is innocent.

"It has been conclusively established they are Pakistani nationals," she said.

There are many witness reports but the creature's existence remains to be established conclusively.

The cause of the explosion is never conclusively established.

The origins of haplogroup M1 have yet to be conclusively established.

As was stated earlier, the origin of the name Gainesville has not been established conclusively.

Responsibility for the shooting in Maribor was never conclusively established.

The health risks of these low- and medium-level sources have not been conclusively established.