Lehmann, J.F. Therapeutic heat and could. Baltimore USA, Williams a Wilkins, 1990, p 725
Water treatment Handbook, Seventh edition, Degremont: France 2007, ISBN 978-1-84585-005-0
Twort, A. Ratnayaka, D. Brand J.: Water supply, London IWA Publishing 2000, ISBN 0-340-72018-2