The phrase "asserted in one" is correct and usable in written English.
It can be used when referring to a statement or claim that has been made or declared in a singular context or document.
Example: "The findings of the study were clearly asserted in one of the key sections of the report."
Alternatives: "stated in one" or "declared in one".
Far from being "well received," as Pope Paul asserted in one of his audiences a few weeks later, the document started a serious crisis within the Church, the proportions of which are only beginning to be revealed.
"I feel like I'm solidly in the high-art literary tradition," he asserted in one of a series of interviews that resulted in his disinvitation from Ms. Winfrey's talk show and inspired an orgy of populist finger-wagging.
Yoo asserted in one memo that "any effort by Congress to regulate the interrogation of battlefield detainees would violate the constitution's sole investing of the commander-in-chief authority in the president".
It is true that appellees asserted in one short paragraph of their brief in this Court that the county-wide election method was resorted to by Georgia in order to minimize the strength of racial and political minorities in the populous urban counties.
Not only was this the best show on Broadway on the "Great White Way" for that hour, but it proved the correctness of a political claim, asserted in one of the OWS signs written after the police raided Zuccotti Park.
Daniel M. McDermott, the Justice Department's United States Trustee for the northern Ohio region, asserted in one document that Mr. Beachy had been insolvent at least since December 2001 and probably as early as 1998, when his handwritten ledger showed his portfolio's market value as $23.6 million, while investors were owed $26.6 million.
As she asserts in one of many spot-on takedowns of "parenting," with all the prodding, controlling, and shaping of offspring the term implies, we don't "wife" our husbands or "friend" our companions, nor do we evaluate our "success" as friends or spouses by the latter's achievements.
On five billboards near the site of the big game in New Jersey, the Marijuana Policy Project questions the NFL's ban on pot use by players, asserting in one that pot is "safer than alcohol and football".
"There just can't be gods among us," she asserts in one of many monologues.
Trilling asserts in one of the essays in Sincerity and Authenticity ("The Heroic, the Beautiful, the Authentic") that the "import of tragedy depends upon the elevation of the hero".
"Facebook played with the emotions of over half a million users in the name of research, without their consent," one writer asserted in the New Statesman, "But one key thing to remember here – and what becomes clear upon reading through half a decade's worth of news reports – is that Facebook have been doing this for years".
