Scientific journal publication Daily duration of vitamin D synthesis in human skin with relation to latitude, total ozone, altitude, ground cover, aerosols and cloud thickness. Engelsen, O.; Brustad, M.; Aksnes, L.; Lund, E. Publication details Journal: Photochem. Photobiol., 81, 1287–1290, 2005 File: Daily duration (pdf, 0.22 MB)