- Perennial ·snow patches in relation to permafrost distribution: A study of permafrost in a changing climate and a first systematical mapping of perennial snow patches in the area of St. Moritz, Graubunden, Switzerland
- Palaeoecological and palaeoclimatic data as inferred from diatom analysis of a small ice-marginal lake in the Sondre Stromfjord Area, West-Greenland
- Chronostratigraphic and palaeoenvironmental analysis of lake deposits in relation to deglaciation of the Sondre Stromfjord area, West Greenland: a preliminary report
- Het vraagstuk over de oorsprong van de modern mens en de rol die de wadjak mens (Java) daarbij speelt