The evolution of the coxa in mites and other groups of Chelicerata
van der Hammen, L.  Life cycle evolution in mites and other groups of Arachnids
van der Hammen, L.  Notes on the morphological value of embryological data
van der Hammen, L.  Phylogeny of opilioacarids and their affinity with the other mites
van der Hammen, L.  General notes on the fondamental structure of the Gnathosoma
van der Hammen, L.  The segmentation of the appendages of the mites
van der Hammen, L.  The oribatid family Phthiracaridae. IV The leg chaetotaxy of Phthiracarus anonymum Grandjean
Hammen, L.v.d.  The oribatid family Phthiracaridae. 3. Redescription of Phthiracarus nitens (Nicolet)
Hammen, L.v.d.  The oribatid family Phthiracaridae. II. Redescription of Phthiracarus laevigatas (C. L. Koch)
Hammen, L.v.d.