The term "joint article" is correct and can be used in written English.
It is often used when referring to an article, document, or contract that two or more parties have agreed to and signed. For example: After months of negotiation, the two sides signed a joint article outlining the terms of the agreement.
Clegg did not deny that he ordered the joint article to be written.
The Archbishops of Canterbury and York, Rowan Williams and John Sentamu, have written a joint article.
She wrote a joint article with David Tombs, a theology professor from New Zealand, for The Conversation, an academic discussion site.
In a joint article previewing the summit, the energy secretary and the prime minister express their joint determination to see a fall in prices.
The ambassadors of France and Germany wrote a joint article on 4 July strongly criticising the political model embodied by the government and practised also by previous ones.
In a joint article published on Thursday, the two charities say that "years of uncertainty" would follow a vote to leave.
In a joint article published in the Times, Cameron and Obama say Britain and the US can lead efforts to secure world peace.
Then the current foreign secretary, William Hague (Conservative), and a former foreign secretary, Margaret Beckett (Labour), produce a joint article saying AV is "deeply un-British".
She recently wrote a joint article with the new-intake Labour MP Neil Coyle, accusing Corbyn of displaying "weak leadership, poor judgment and a mistaken sense of priorities".
In a joint article in the Times written with the Liberal Democrat schools minister, David Laws, Gove said there was cross-party unity on the proposal.
3.51pm BST Nick Clegg and Michael Gove have written a joint article for the Evening Standard setting out their plans to replace GCSEs.
