1. Serum-vitamin B12 concentration in the elderly;Cape;Geront Clin,1961
2. Influence of age and stomach function on serum vitamin B12 concentration;Doscherholmen;Scand J Gastroenterol,1977
3. Log-normal distribution of serum vitamin B12 levels and dependence of blood values on the B12 level in a large population heavily infected with diphyllobothrium latum;Grasbeck;J Lab Clin Chem Med,1962
4. The vitamin B12-concentration in serum in children;Killander;Nordisk Medicin,1956
5. Insolubilized pure human intrinsic factor used for quantitation of cobalamins in serum;Nexø;Scand J Clin Lab Invest,1981