Mechanical behaviour of the periodontal ligament in-vivo : measurements and numerical analyses / Andries de BoerStudy on the role of collagen in tooth eruption : a biochemical investigation of the influence of lathyrogens on the eruption rate of the impeded rat incisor / Aart Alexander Richard TaverneThe vascularity of the rat periodontal ligament and its relation to bone remodelling / door Jacob Visser