The result being that physical labour — including the personal discrepancies of each individual labourer — is always very evident in Barlow's work, and that another commonsense idea of art — the artist / genius as sole author of a work — is destabilised in the viewer's mind. (artreview.com)
[14] In 1977 - 8 Hamilton undertook a series of collaborations with the artist Dieter Roth that also blurred the definitions of the artist as sole author of their work. (en.wikipedia.org)
In 1920, most scientific papers were written by sole authors, but by 1950 that had changed and co-authorship became the norm. (inc.com)