Sevink, J., Kemmers, R. H., & Emmer, I. M. (1993). Soil research in Dutch forest reserves: the implications of spatial and temporal soil variability. In W. Vos, M. E. A. Broekmeyer, & H. Koop (Eds.), European Forest Reserves (pp. 109-118). Pudoc.
Emmer, I. M., & Sevink, J. (1993). Horizon differentiation in humus forms and its relevance for the study of succession related changes in element stocks in primary forests of Pinus sylvestris L.Scripta Geobotanica, (21), 129-134.
Higginbotham, J., Pedley, J. G., & Sevink, J. (1993). Topography, geology and stratigraphy. In G. Bretschneider (Ed.), The Sanctuary of Santa Venera at Paestum; Arhaeologia Perusina II (pp. 21-53). Anonymus.