The energy flux from Vega has been precisely measured against standard light sources.

Everything found in the "unconscious" periods of every patient, when checked against other sources, was found to be exact.

After that goal had been reached, the administration would consider options against other sources of terrorist activity.

"But this really shows you, this story would have never come out if we had a rule against anonymous sources."

You must evaluate your evidence, check it against other sources and decide if it is reliable.

The dates have been confirmed to be essentially accurate whenever they are checked against independent sources.

Its information should be checked against other sources where these are available, and against the primary research scientific literature where possible.

Human intelligence, gathered by spies, is usually carefully tested against unrelated sources.

When they start to draw the basic state pension, many continue to have their full personal allowances attributed by mistake against other sources.