Carlsson P, Kallskog Ö, Bodin B, Andersson A, Jansson L. Multiple Injections of Coloured Microspheres for Islet Blood Flow Measurements in Anaesthetised Rats: Influence of Microsphere Size. Upsala Journal of Medical Sciences. 2002 Jan;107(2):111–20. doi: 10.3109/2000-1967-134.