New insights into the systematics of Parasitiformes (Acarina) with new species from South America
Karg, W. and Schorlemmer, A.  Origin and classification of the Ixodides (ticks) within the Parasitiformes Reuter, 1909 (Acarina)
Karg, W. and Shorlemmer, A.  Phylogeny of opilioacarids and their affinity with the other mites
van der Hammen, L.