1.
An updated checklist of the lichens of St. Eustatius, Netherlands Antilles
Vegetation succession and habitat restoration in Dutch lichen-rich inland drift sands ; Sukzession und Lebensraumrenaturierung in flechtenreichen Binnendünen der Niederlande
A lichenological excursion in May 1997 near Han-sur-Lesse and Saint-Hubert, with notes on rare or critical taxa of the flora of Belgium and Luxembourg