You're probably looking for something like Sudbery 1977, https://dougsweetser.github.io/Q/Stuff/pdfs/Quaternionic-analysis-memo.pdf https://dougsweetser.github

You're probably looking for something like Sudbery 1977, https://dougsweetser.github.io/Q/Stuff/pdfs/Quaternionic-analysis-memo.pdf https://dougsweetser.github.io/Q/Stuff/pdfs/Quaternionic-ana... (published 1979, doi: 10.1017/S0305004100055638)