REFERENCES
- Conte , S. D. and de Boor , C. 1980 . Elementary Numerical Analysis. An Algorithmic Approach. International Student Edition, McGraw-Hill .
- ISO . 1983 . ISO Standards Handbook no. 16 56 – 18 . Geneva , , Switzerland : ISO .
- WMO . 1980 . Manual on Stream Gauging. Operational Hydrology Report no. 13. WMO—No. 519 Switzerland : Geneva .