The phrase "asserted previously" is correct and usable in written English.
It can be used when referring back to something that has been stated or claimed earlier in a text or conversation.
Example: "The findings of this study support the hypothesis that was asserted previously in the literature."
Alternatives: "stated earlier" or "claimed before".
Second, the author maintains, his book is "painstakingly rooted in primary sources" (a claim bolstered by his 34 pages of footnotes), including, he asserts, previously unmined Secret Service records.
She felt that the disease itself caused the character to grow a "backbone" as he had rarely asserted himself previously to the Captain.
In Senegal, a prominent new figure of success is that of the moodu moodu, an urban merchant who now asserts his previously stigmatized rural origins, moves easily in transnational commercial and financial networks, and operates in the 'interstices of … illegality' (Banégas and Warnier 2001: 8).
Mr Saleh had previously asserted his power via handouts to tribal sheikhs and political allies.
Mr. Musharraf, who had previously asserted that the case against him was politically motivated, pleaded not guilty, his lawyers said.
Uefa did not say why it had previously asserted that it had not had any dealings with any of the indicted companies or individuals.
Representative Michele Bachmann, who has previously asserted that global warming is "manufactured science" and a hoax, again questioned whether human activity was affecting the global climate.
Mrs. Bachmann, who has previously asserted that global warming is "manufactured science" and a hoax, again questioned whether human activity was affecting the global climate.
Mr. Wu, who declined to comment through his lawyer today, previously asserted that Enron was behind his dismissal, but today's disclosure was the first to show pressure was applied by Enron officials.
Where he previously asserted that he would stay away from efforts to protect or overturn the state abortion law, he now said he would fight moves to make it illegal.
