1. Mealworms can eat toxic polystyrene foam safely, Modern Farmer, modernfarmer.com/2020/01/mealworms-can-eat-toxic-styrofoam-safely/
2. Archimedes and the area of sphere, Mathematics@CUHK, cuhkmath.wordpress.com/2018/01/05/archimedes-and-the-area-of-sphere/
3. Tom M. Apostol and Mamikon A. Mnatsakanian, A fresh look at the method of Archimedes, The American Mathematical Monthly, Vol.111, No.6, pp.496–508, 2004.
4. Marvin Bittinger, Neal Brand and John Quintanilla, Calculus for the Life Sciences, 2006, New York: Pearson Education, Inc.
5. Symmetry in Mathematics, Wikipedia, the free Encyclopedia, en.wiklpedia.org/wiki/Symmetry_in_mathematics