Huub Kooijman, Aldrik H. Velders and Anthony L. Spek: N-Methylbenzimidazole N-methylbenzimidazolium hexafluorophosphate. Acta Crystallogr. (2006). E62 (2006) o21-o23.
Jeroen van Buijtenen, Jan Meuldijk, Jef A. J. M. Vekemans, Lumbertus A. Hulshof, Huub Kooijman, and Anthony L. Spek: Dinuclear Ruthenium Complexes Bearing Dicarboxylate and Phosphine Ligands. Acceptorless Catalytic Dehydrogenation of 1-Phenylethanol. Organometallics, 25 (2006) 873-881.
Christian Müller, Leire Guarrotxena López, Huub Kooijman, Anthony L. Spek and Dieter Vogt: Chiral bidentate phosphabenzene-based ligands: synthesis, coordination chemistry, and application in Rh-catalyzed asymmetric hydrogenations. Tetrahedron Letters 47 (2006) 2017-2020.