1. Diphyllobothriasis in man;von,1977
2. Serum vitamin B12 levels and incidence of tapeworm anemia in a population heavily infected with Diphyllobothrium latum;Nyberg;Am J Clin Nutr,1961
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;Gräsbeck;J Lab Clin Med,1962
4. Establishment and use of normal values;Gräsbeck;Scand J Clin Lab Invest,1969
5. Terminology and biological aspects of reference values;Gräsbeck,1978