Axel Berndt, "Musical Tempo Curves" , Proceedings of the International Computer Music Conference 2011, University of Huddersfield, UK, 31 July - 5 August 2011.
Peter Collingridge, "Panning and Zooming", 22 June 2011.
Heydon Pickering, "Creating Cel Animations With SVG" , Smashing Magazine, 14 September 2015.
"Weafs.py", CSS SVG Path - Circular Progress Bar (small ammends)", Stack Overflow, answer by "Weafs.py", 22 January 2015.