Ottar Nygård, Stein Emil Vollset, Helga Refsum, Inger Stensvold, Aage Tverdal, Jan Erik Nordrehaug, Per Magne Ueland, Gunnar Kvåle,
Total Plasma Homocysteine and Cardiovascular Risk Profile JAMA. ,vol. 274, pp. 1526- 1533 ,(1995) ,
10.1001/JAMA.1995.03530190040032