Гипербола (математика)
Вуламалли
- Kazarinoff, Nicholas D. (2003), Ruler and the Round, Mineola, N.Y.: Dover, ISBN 0-486-42515-0
- Oakley, C. O., Ph.D. (1944), An Outline of the Calculus, New York: Barnes & Noble
- Protter, Murray H.; Morrey, Charles B., Jr. (1970), College Calculus with Analytic Geometry (2nd ed.), Reading: Addison-Wesley, LCCN 76087042