Bibliography
- S.S. Mader (2007): Biology, 9th edition, McGraw Hill Companies, New York, ISBN 978-0-07-246463-4
- P.H. Raven, R.F. Evert, S.E. Eichhorn (2005): Biology of Plants, 7th Edition, W.H. Freeman and Company Publishers, New York, ISBN 0-7167-1007-2
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