 | March 13, 2015.{{cite web}}: CS1 maint: unfit URL (link) Webb, Ann R.; Engelsen, Ola (2006). "Calculated Ultraviolet Exposure Levels for a Healthy Vitamin... 136 KB (15,733 words) - 08:24, 18 April 2024 |
| March 13, 2015.{{cite web}}: CS1 maint: unfit URL (link) Webb, Ann R.; Engelsen, Ola (2006). "Calculated Ultraviolet Exposure Levels for a Healthy Vitamin... 136 KB (15,733 words) - 08:24, 18 April 2024 |