"as repeatedly mentioned" is grammatically correct and can be used in written English.
It is used to refer to something that has been mentioned multiple times before in the same context. Example: As repeatedly mentioned in our previous meetings, our company's main focus for this quarter is increasing sales in the Asian market.
Indeed, as repeatedly mentioned above, we have the example of Israel's use, or rather abuse, of this system to provide specific empirical evidence against the introduction of torture warrants.
As repeatedly mentioned, during home delivery, almost all newborns are wrapped with clean new towel and put in front of mothers or someone caries them carefully.
Yahoo's big pitch to developers is its 1 billion-strong worldwide audience, as executives repeatedly mentioned "traffic" and "distribution" as the big draw for developers hungry to reach potential users quickly.
However, as has been repeatedly mentioned, the present study and those quoted above differ in their method, particularly subject selection.
Limited classroom space, overuse of temporary buildings and issues such as rising damp and leaking roofs were repeatedly mentioned, as well as a lack of other vital facilities such as pupil intervention rooms and meeting spaces.
Soon after Doherty's death, it was misreported – then taken as fact and repeatedly mentioned over the years – that he had actually fallen into the water in Amsterdam and, once that detail was out there, it spread like spilt milk.
As outlined in Table 1, certain organisms are repeatedly mentioned as being linked to different autoimmune disorders.
Deutsche Telekom has been repeatedly mentioned as the company most likely to go after Sprint.
They've been repeatedly mentioned as possible Nobel laureates — an honor that also comes with a seven-figure sum.
Mr. Lothrop was repeatedly mentioned as a Communist, but no proof was ever given publicly and he always denied it.
RYAN LIZZA: I was very careful to only highlight thinkers and influences that Bachmann herself has repeatedly mentioned as important to her, including in my interview with her.
