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Conservatoire botanique national des Pyrénées et de Midi-Pyrénées

Rodwell, J.S., Schaminée, J.H.J., Mucina, L., Pignatti, S., Dring, J., Moss, D., 2002 . The diversity of european vegetation. An overview of phytosociological alliances and their relationships to EUNIS habitats. National Reference Centre for Agriculture, Nature and Fisheries, Wageningen. 168 pp.