The researchers acknowledged that often there was no single reason why someone went bankrupt.

The researchers acknowledged that inside information would be required in many cases to plant a hostile program.

The researchers acknowledged that their system has not been tested in a formal study.

Researchers have acknowledged that other domains of general knowledge may exist.

Experts still disagree over salt's effects on blood pressure, the researchers acknowledged.

The researchers acknowledged that they were not able to examine research contracts themselves.

Researchers in the field acknowledge that it is difficult to judge precisely how reliable the data are.

But beyond that generation, the industry's leading researchers acknowledge there remain far more questions than answers.

The researchers acknowledge that the evidence is not "fully conclusive."

The researchers acknowledge that their study, published yesterday in the journal Cancer, has certain weaknesses.