The extent of his involvement in the English underworld has never been reliably established.

The number of Egyptians killed was "never reliably established".

"What we knew about the ownership was that a lot of it couldn't be reliably established," said one senior American intelligence official.

With the ship's name, place of origin and date of construction reliably established, interest quickened.

Their range in the eastern Atlantic has been reliably established from Senegal to the Congo.

However, the historicity of these events is not absolutely reliably established.

The dating and chronology of the siege can be most reliably established from an examination of the documents.

However, most of this subdivision, in particular the monophyly of the Oxycorynina, is by no means reliably established.

It is assumed that the active agents of the plant may have an impact on the psyche, however, is not reliably established.