1. Rødliste '90. Sœrligt beskyttelseskrœvende planter og dyr i Danmark;Asbirk,1991
2. Topo- and microclimatology in alpine areas;Barry,1974
3. Critical loads for nitrogen eutrophication of terrestrial and wetland ecosystems based upon changes in vegetation and fauna;Bobbink,1992
4. Naturtypen overdrev—vegetationen og dens foruds˦tninger;Bruun,1993