Stücker, M, J Steinbrügge, C Ihrig, K Hoffmann, D Ihrig, A Röchling, DW Lübbers, H Jungmann, and P. Altmeyer. 1998. “Rhythmical Variations of Haemoglobin Oxygenation in Cutaneous Capillaries”. Acta Dermato-Venereologica 78 (6):408-11. https://doi.org/10.1080/000155598442665.