Highhorse, “Atomic Icons and Symbols,” http://www.istockphoto.com/stock-illustration-486722-atomic-icons-and-symbols-1-credit-vector.php, published Mar. 13, 2005. |
Nicemonkey, “Illustrated spiral effect,” http://depositphotos.com/3422626/stock-illustration-illustrated-spiral-effect.html?sst=1000&sqc=1002&sqm=1017&sw=5cm3n1, published Apr. 10, 2011. |
I love a good (useless?) infographic, don't you?, by Emily Schmidt, dated Aug. 23, 2012, littlebittydesign.blogspot.com. <URL:http://littlebittydesign.blogspot.com/2012/08/venn-diagram-tastic.html>. |
Circle-Circle Intersection, by Eric Weisstein, dated Nov. 23, 2012, WolframMathworld. <URL:https://web.archive.org/web/20121123235027/http://mathworld.wolfram.com/Circle-CircleIntersection.html>./. |
Trademark Serial No. 86001153, Apple Inc., filed Jul. 2, 2013, priority filing date Apr. 15, 2013. |
Illustrator Help /Transparency and blending modes, dated Apr. 25, 2014, helpx.adobe.com. <URL:https://web.archive.org/web/20140425201438/https://helpx.adobe.com/illustrator/using/transarency-blending-modes.html>. |
Stock Vector: Seed of Life in Flower of Life, by Peter Hermes Furian, dated Jun. 6, 2014, dreamstime, <URL: https://www.dreamstime.com/royalty-free-stock-photo-seed-life-flower-life-center-geometrical-figure-composed-multiple-evenly-spaced-overlapping-circles-image40086225>. |
WatchOS Preview—Breathe App, by Apple, dated Jun. 13, 2016, youtube.com. <URL: https://www.youtube.com/watch?timecontinue=1&v=fHllxZ0PW9w>. |
Clip Art ECT Circular Rosette With 6 Petals, dated Mar. 6, 2014, etc.usf.edu. <URL: https://web.archive.org/web/20140306175900/http://etc.usf.edu/cliparU42900/42940/circle-46_42940.htm>. |