GA Heymann, D Carstanjen, H Kiesewetter, and A Salama. 2004. “Polymorphism of the Alpha4-Subunit of VLA-4 Integrin and Bone Marrow Transplantation”. Haematologica 89 (7). Pavia, Italy, 882-84. https://haematologica.org/article/view/3163.