H.G.M. Ketner-Oostra

Decline of lichen-diversity in calcium-poor coastal dune vegetation since the 1970s, related to grass and moss encroachment

K. Sykora, H.G.M. Ketner-Oostra, 2004 .

Lichen-rich coastal and inland sand dunes (Corynephorion) in the Netherlands: vegetation dynamics and nature management.

H.G.M. Ketner-Oostra, 2006 .