25 years of landscape ecology: scienfitic principles in practice : proceedings of the 7th IALE world congress - part 1 / Editors: R.G.H. Bunce, R.H.G. Jongman, L. Hojas, S. Weel . Wageningen :  Published by IALE , 2007 . 309 s . ISBN 978-90-78514-02-2 .