Literatura

1. Bartsch, H.-J. (2000). Matematické vzorce. Mladá fronta.
2. NIST Digital Library of Mathematical Functions. http://dlmf.nist.gov/, Release 1.0.15 of 2017-06-01. http://dlmf.nist.gov/
3. Weisstein, E. W. Decreasing Function. MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/DecreasingFunction.html