The phrase "assertion according to" is correct and usable in written English.
It can be used when referencing a claim or statement made by someone or something, indicating the source of that assertion.
Example: "The assertion according to the latest research suggests that climate change is accelerating at an unprecedented rate."
Alternatives: "claim based on" or "statement from".
This last assertion, according to Rabbi Boteach, was based largely on information he received unsolicited from a stranger, Daniel Nicherie, the former convict in this yarn.
It is part of a full account of assertion, according to Jary, that assertions are subject to these safeguards.
The NSA has a moderate degree of confidence in this assertion, according to the report.
So far, however, officials have not produced transcripts or recordings of the conversations to back up the assertion, according to witnesses who have been interviewed.
Trump last month claimed the government had stopped terrorists from entering the U.S. from Mexico, but Reuters reported that no evidence backed up the president's assertion, according to four government sources.
One of the better documented assertions, according to experts, holds that when a muscle is tightened the tension slows blood flow.
Modern intelligent-design theorists have made similar assertions; according to Behe, "The argument from imperfection overlooks the possibility that the designer might have multiple motives, with engineering excellence oftentimes relegated to a secondary role".
Sorensen differentiates between assertions and non-assertions according to "narrow plausibility": "To qualify as an assertion, a lie must have narrow plausibility.
According to the former, it is the intentions a speaker has with respect to the mind of the hearer that constitutes assertion, while according to the latter, assertion is constituted by the change of the social relation between speaker and addressee that the utterance brings about.
Their lawsuit hinges on the assertion that, according to Arkansas law, information collected involving minors is not subject to disclosure under the Freedom of Information Act.
A simple assertion – but invalid, according to some.
