The phrase "as having shown" is correct and usable in written English.
You can use it when you want to emphasize that something has already been demonstrated or proven. For example: "The study provided evidence, as having shown, that long-term stress can lead to physical health problems."
Doggart is also cited as having shown the FBI's source a map of Islamberg, where he identified the buildings he intended to destroy.
The environmental campaign group – which has long been against GM foods – claims that a "silent revolution" in agriculture is showing a stronger track record than the GM process, which it labels as having shown disappointing results.
Rather than being vilified, Triesman could be regarded as having shown leadership on a vital issue for English football, which did not make him popular with everybody, but ultimately helped to introduce important reforms.
The English-language Buenos Aires Herald, however, pointed out that "the snickering about the President's mental health comes at a time [when] she is perceived by much of the public, including those who oppose her, as having shown tremendous strength immediately after her husband's death".
The independent review, led by Thomas R. Pickering, a former ambassador, criticized officials in the State Department's Bureau for Diplomatic Security as having shown a "lack of proactive leadership," and said that some officials in the Bureau of Near Eastern Affairs "showed a lack of ownership of Benghazi's security issues".
August 2011: Adebowale identified by GCHQ as having shown an interest in extremist material online.
Minimum and maximum vales as have shown in bold.
As have shown recent studies, CD4 cell counts are important indicators [ 38, 39] of mortality in this analysis.
Furthermore, many patients with microalbuminuria often revert to normal AERs, as we have shown here and as has been shown previously (18).
In line with this, p53 agonists such as nutlin have shown promise as potential therapies.
There is no such thing as a government computer secret, as WikiLeaks has shown.
